Never-before-seen video released Thursday shows a security guard admitting an unidentified man into the Isabella Stewart Gardner Museum the night before the infamous 1990 art heist, adding a stunning new clue to Boston’s most enduring mystery. 
 
 The video footage, taken by the museum’s surveillance cameras and recently examined by investigators, shows the night watchman open the museum’s side door and grant unauthorized access to the man at about 12:49 a.m. on March 17, 1990 — 24 hours before the museum was robbed by two men dressed as police officers who arrived at the same door. 
 
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 The man spent about three minutes in the reception area and appears to fumble through paperwork or a wallet before leaving. 
 
 Law enforcement officials are now questioning whether the suspicious actions constituted a dry run for the heist, and it refocuses the spotlight on Richard Abath, the rock musician moonlighting as a security guard who fell under the suspicion of authorities soon after the robbery. Authorities did not say Abath was the guard in the video, but three officials familiar with the investigation confirmed to the Globe that it is he. 
 
 Officials released the video to solicit the public’s help in identifying the second man, hoping to make some movement in the largest unsolved art theft in the world. 
 
 It was not immediately clear why the surveillance footage of the night before the robbery had not been made public before, and whether it was viewed by the FBI in the initial investigation. The robbers had seized surveillance footage from the night of the heist, though they did not take footage from the previous night. 
 
 Several law enforcement officials said the video appears to have been overlooked and mixed in with other evidence at the onset of the case. US Attorney Carmen M. Ortiz said that a team of investigators began reviewing the original evidence, and that one of them, Assistant US Attorney Robert Fisher, requested the video, which was in the custody of the FBI. Officials then decided to release it to the public in hopes it could lead to new information. 
 
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 “We have this big question mark as to who this individual is,” Ortiz said. “The hope is that someone will recognize the unauthorized visitor . . . and provide some fruitful leads that will help us figure out where the paintings are, lead to some information, to some people we haven’t thought of before.” 
 
 Abath, who is now in his late 40s and lives in Vermont, has denied any ties to the robbery plot, though he admitted to violating museum protocol at the time of the robbery by opening the door to the two men dressed as police officers claiming to be responding to a disturbance. Protocol required him to seek a supervisor’s approval before letting anyone into the museum after hours. 
 
 A Globe reporter who went to Abath’s house Thursday morning in Brattleboro was turned away by a woman who said he did not live there. Abath has admitted to bringing friends to the museum at least once several months before the robbery, but he never disclosed that he let someone in the night before the heist. He has said he opened the door only for security checks. 
 
 “What you see in the video does not comport with what we have been told in the past,” said Anthony Amore, the museum’s director of security, who has worked with the FBI and the US attorney’s office in a renewed push in recent years to solve the heist. 
 
 He said the video “is compelling in that perhaps the identity of this person . . . will shed new light on exactly what happened March 18 [1990], who else may be involved, and hopefully lead us to our paintings.” 
 
 Globe reporters discuss new video in Gardner museum heist 
 
 No one can be charged with the theft of the paintings because the statute of limitations has expired, but authorities could still seek charges against someone in possession of the stolen works. Ortiz has said she would consider granting immunity to anyone who may possess the paintings in exchange for their return. The museum has offered a $5 million reward for the return of the works. 
 
 Abath, who has recently worked as a teacher’s aide in Vermont, has long been under suspicion, in part because of his admission to violating museum protocol and because of the way the robbery was carried out. 
 
 Once Abath buzzed the men into the museum’s side entrance on Palace Road at 1:24 a.m. on March 18, 1990, the men subdued him, then waited for the second guard on duty and tied him up as well. They then spent 81 minutes in the museum, making off with 13 works of art, including three Rembrandts, a Vermeer, and a Manet. 
 
 Investigators have questioned why Abath’s footsteps were the only ones picked up by motion detectors in the first-floor gallery, where one of the stolen paintings was taken, just before the two robbers scoured the rest of the museum. 
 
 One of Abath’s most questionable disclosures was that he opened and closed the Palace Road door 20 minutes before the robbery, which prompted investigators to ask whether he was signaling the robbers. The action was also in violation of security protocol, though Abath maintained he routinely opened the door during his rounds. 
 
 He did open the door on March 17. The footage starts just before 1 a.m., and it shows a car moving in reverse on Palace Road, a one-way street, after the second guard on duty went on his rounds. An unidentified man approaches the museum from the direction of the car, and Abath seems to grant him access through the first door by hitting an intercom button. 
 
 The man does not enter the museum’s second door, but returns to the car and turns on its parking lights. 
 
 The footage then shows the man returning to the museum. Abath again buzzes the man in, but this time the man remains in the museum reception area for more than three minutes before returning to the car and leaving. 
 
 The footage also shows that the unidentified man parked the car at roughly the same spot where several young people who had emerged from a St. Patrick’s Day party the morning of the robbery reported seeing a red hatchback. One of the partygoers reported seeing two men dressed as police officers inside, roughly an hour before the robbery occurred. 
 
 The color, make, and model of the car in the new surveillance video could not be determined, though authorities said Thursday that it matches the general description of the vehicle seen the night of the robbery. 
 
 Lyle Grindle, who headed security for the museum at the time of the theft, said in an interview Thursday that he had been shown the security tape by federal investigators about a month ago, but that he was unable to identify the visitor who had been allowed into the museum. He said he told investigators that allowing such a visit was a violation of the museum’s strict security procedures, which prohibited any late-night entries, even by police or firefighters. 
 
 Grindle said it appeared to him that the tape had been recently unearthed by the federal officials, but he did not ask why it had not been viewed before by investigators. 
 
 “I believe all the prior tapes from the previous nights were taken by the FBI, and I never saw them again,” said Grindle, who stayed on as security director for years after the heist and oversaw an upgrade of the museum’s security system. 
 
 Grindle said he did not know if Abath had been questioned by the federal officials who interviewed him. 
 
 “Someone has to explain why the security protocol was broken two nights in a row now, and I think only Rick can answer that question now,” Grindle said. 
 
 It was not immediately clear if Abath has recently discussed his actions that night with authorities. 
 
 No one has ever been charged in connection with the theft of the paintings, and none of the works have been recovered, making it Boston’s last great mystery following the capture and conviction of notorious gangster and longtime fugitive James “Whitey” Bulger. The artworks are considered priceless on the black market. 
 
 In 2013 the FBI publicly disclosed for the first time that agents believe they know who took the art, and that the works had made their way through underground organized crime channels from Boston through Connecticut to Philadelphia, where they were last believed to be seen. 
 
 Amore called the new video troubling, but added, “It doesn’t knock us off course on the stuff we’ve been talking about.” He said the video “raises more questions than answers.” ||||| BOSTON—Twenty-five years after the notorious burglary of the Isabella Stewart Gardner Museum in Boston, law enforcement officials are seeking the public’s assistance in identifying an unauthorized visitor to the museum the night before the theft. That person entered the museum through the same door as the thieves in the middle of the night, 24 hours before the theft. 
 
 “Over many months we have engaged in an exhaustive re-examination of the original evidence in this case. Our aim has been to ensure that all avenues have been explored in the continuing quest to recover these artworks,” said United States Attorney Carmen Ortiz. “Today we are releasing video images from the night before the theft—images which have not previously been seen by the public—with the hope of identifying an unauthorized visitor to the museum. With the public’s help, we may be able to develop new information that could lead to the recovery of these invaluable works of art.” 
 
 The video footage released today, captured by Museum security cameras 24 hours before the Gardner heist, shows an automobile pull up next to a rear entrance of the Museum. The car matches the general description of a vehicle that was reported to have been parked outside the Museum moments prior to the theft on March 18, 1990. 
 
 The video also shows an unidentified man exiting the automobile and then being allowed inside the Museum, against Museum policy, by a security guard. That event occurred at 12:49 p.m. on March 17, 1990, almost exactly 24 hours before the thieves entered the museum through the same door. 
 
 While the images of both the vehicle and the unidentified man are low resolution, law enforcement officials hope that releasing the footage will assist with identifying the man or the vehicle in the video. 
 
 Anyone with information regarding the video should call the FBI at 617-742-5533 or the Isabella Gardner Museum at 617-278-5114. 
 
 Vincent Lisi, Special Agent in Charge of the FBI in Boston said, “This latest request for the public’s assistance illustrates the FBI’s continued commitment to the Gardner investigation. By releasing this video, we hope to generate meaningful leads and ultimately recover the stolen artwork.” 
 
 A $5 million reward has been offered by the Museum for information that leads directly to the recovery of all of the stolen items in good condition. The recovery of an individual object will result in a portion of the reward, based upon the object’s market value relative to the other stolen objects. 
 
 “We remain committed to one goal: the return of all 13 works to their rightful place, which is here at the Isabella Stewart Gardner Museum. To that end, we support the efforts that the United States Attorney and the Federal Bureau of Investigation are making to uncover any and all information related to the theft of our artwork. We believe that no stone should be left unturned,” said Anthony Amore, Director of Security at the Gardner Museum. 
 
 In the early morning hours of March 18, 1990, two white males dressed in Boston Police uniforms gained entrance to the Gardner Museum by advising the security guard at the watch desk that they were responding to a report of a disturbance within the compound. Against Museum policy, the guard allowed the thieves into the facility. Upon entry the two thieves subdued the on-duty security personnel, handcuffed them, and secured both guards in separate remote areas of the Museum’s basement. The suspects did not brandish weapons, nor were any weapons seen during the heist. No panic button was activated and no Boston Police notification was made during the robbery. The video surveillance film from the evening of the robbery was seized by the thieves prior to departure. They did not take the video footage from the night before. 
 
 The combined value of the 13 works of art stolen during the Gardner theft is at least $500 million, though they are considered priceless within the art community. The following objects were stolen during the burglary and have been missing for the past 25 years: 
 
 1) Vermeer’s "The Concert" 
 
 2) Rembrandt’s "A Lady and Gentleman in Black" 
 
 3) Rembrandt’s "The Storm on the Sea of Galilee" 
 
 4) Rembrandt’s "Self Portrait" 
 
 5) Govaert Flinck’s "Landscape with an Obelisk" 
 
 6) A Shang Dynasty Chinese Bronze Beaker from 1200-1100 BC 
 
 7) Degas' "La Sortie du Pelage" 
 
 8) Degas' "Cortege Aux Environs de Florence" 
 
 9) Degas' "Three Mounted Jockeys" 
 
 10) Degas' "Program for an Artistic Soiree" (charcoal on white paper) 
 
 11) Degas' "Program for an Artistic Soiree" (less finished charcoal on buff paper) 
 
 12) Manet’s "Chez Tortoni" 
 
 13) Napoleonic Eagle Finial 
 
 - More information on Gardner Museum theft ||||| BOSTON (AP) — The two men suspected of masquerading as police officers to rob an art museum of $500 million worth of masterpieces in 1990 are dead, the FBI says. 
 
 FILE - In this March 11, 2010 file photo, the empty frame, center, from which thieves cut Rembrandt's "Storm on the Sea of Galilee" remains on display at the Isabella Stewart Gardner Museum in Boston.... (Associated Press) 
 
 FILE - This undated file photograph provided by the Isabella Stewart Gardner Museum shows the painting "Chez Tortoni," by Edouard Manet, one of more than a dozen works of art stolen in the early hours... (Associated Press) 
 
 FILE - In this March 21, 1990 file photo, a security guard stands outside the Dutch Room of the Isabella Stewart Gardner Museum in Boston, where robbers stole more than a dozen works of art by Rembrandt,... (Associated Press) 
 
 In this March 18, 1990 still image from surveillance video released by the U.S. Attorney's Office,Thursday, Aug. 6, 2015, an unauthorized visitor walks inside the rear entrance of the Isabella Stewart... (Associated Press) 
 
 Two years ago, investigators announced they knew who stole 13 works — including paintings by Rembrandt and Vermeer — from Boston's Isabella Stewart Gardner Museum, but they refused to elaborate, saying only that the investigation was focused on recovering the artwork. 
 
 Now Peter Kowenhoven, the FBI's assistant special agent in charge in Boston, has settled the lingering mystery of why no one was ever charged in the biggest art heist in U.S. history: The suspects are dead. 
 
 "The focus of the investigation for many years was: Who did this heist? And we have through the great investigative work identified who did this heist, and both those individuals are deceased," Kowenhoven told The Associated Press in an interview. "So now the focus of the investigation is the recovery of the art." 
 
 He declined to identify the men. 
 
 On Thursday, authorities released grainy surveillance video from the eve of the heist and appealed anew to the public for help in finding the artworks. 
 
 The low-resolution video — captured by museum security cameras — shows a security guard appearing to hit an intercom button, then to grant access to a man who can be seen in the museum's reception area at about 12:49 a.m. on March 17, 1990, almost exactly 24 hours before the heist. 
 
 The man is also seen getting out of a car matching the general description of one reported to be parked outside the museum minutes before the theft. He uses the same rear entrance as the thieves, according to the office of U.S. Attorney Carmen Ortiz, which released the video. 
 
 The stolen artwork includes Vermeer's "The Concert" and Rembrandt's "The Storm on the Sea of Galilee." 
 
 A $5 million reward has been offered by the museum for information that leads to the recovery of the stolen artwork in good condition. 
 
 With the thieves dead, "all our investigative efforts are being guided toward the recovery of this art," Kowenhoven said. 
 
 "Every lead, every tip, everything that comes in we're tracking down, no matter where it is in the area, in the country or overseas," he said. "These are cultural masterpieces that we are trying to recover." 
 
 Authorities have said that on March 18, 1990, two men dressed in Boston police uniforms gained entrance to the museum by telling the security guard at the watch desk that they were responding to a report of a disturbance. 
 
 Against museum policy, the guard allowed the men into the museum. The thieves handcuffed the museum's two guards on duty and put them in separate areas of the museum's basement. 
 
 In 2013, authorities said the robbers belonged to a criminal organization based in New England and the mid-Atlantic states and took the art to Connecticut and the Philadelphia region in the years after the theft. They were offered for sale in Philadelphia about a decade ago and have not been seen since, the FBI said at the time. 
 
 ___ 
 
 Online: https://www.youtube.com/watch?v=qSw1BsJEBB4 ||||| BOSTON (AP) — Twenty-five years after the famed art heist at Boston's Isabella Stewart Gardner Museum, law enforcement officials released new surveillance video Thursday showing an unauthorized visitor entering the museum the night before the robbery. 
 
 FILE - In this March 11, 2010 file photo, the empty frame, center, from which thieves cut Rembrandt's "Storm on the Sea of Galilee" remains on display at the Isabella Stewart Gardner Museum in Boston.... (Associated Press) 
 
 FILE - This undated file photograph provided by the Isabella Stewart Gardner Museum shows the painting "Chez Tortoni," by Edouard Manet, one of more than a dozen works of art stolen in the early hours... (Associated Press) 
 
 FILE - In this March 21, 1990 file photo, a security guard stands outside the Dutch Room of the Isabella Stewart Gardner Museum in Boston, where robbers stole more than a dozen works of art by Rembrandt,... (Associated Press) 
 
 In this March 18, 1990 still image from surveillance video released by the U.S. Attorney's Office,Thursday, Aug. 6, 2015, an unauthorized visitor walks inside the rear entrance of the Isabella Stewart... (Associated Press) 
 
 Authorities hope the never-before seen video will spark leads to help recover the 13 pieces of stolen artwork, worth at least $500 million. 
 
 The low-resolution video shows a security guard appearing to hit an intercom button, then to grant access to a man who can be seen in the museum's reception area at about 12:49 a.m. on March 17, 1990, nearly exactly 24 hours before the heist. 
 
 The man is also seen getting out of a car matching the general description of one reported to be parked outside the museum minutes before the theft. He uses the same rear entrance as the thieves, according to the office of U.S. Attorney Carmen Ortiz, which released the video. 
 
 The stolen artwork includes Vermeer's "The Concert" and Rembrandt's "The Storm on the Sea of Galilee." 
 
 Ortiz's office did not immediately respond to questions about why the video footage — captured by museum security cameras — was not released earlier. 
 
 "Over many months we have engaged in an exhaustive re-examination of the original evidence in this case. Our aim has been to ensure that all avenues have been explored in the continuing quest to recover these artworks," Ortiz said in a prepared statement. 
 
 Ortiz said officials are hoping the public may be able to help authorities identify the unauthorized visitor or the car seen in the video. 
 
 "With the public's help, we may be able to develop new information that could lead to the recovery of these invaluable works of art," she said. 
 
 A $5 million reward has been offered by the museum for information that leads to the recovery of the stolen artwork in good condition. 
 
 "We remain committed to one goal: the return of all 13 works to their rightful place, which is here at the Isabella Stewart Gardner Museum," said Anthony Amore, Director of Security at the Gardner Museum. 
 
 Authorities have repeatedly said on March 18, 1990, two white men dressed in Boston police uniforms gained entrance to the museum by telling the security guard at the watch desk that they were responding to a report of a disturbance. 
 
 Against museum policy, the guard allowed the men into the museum. The thieves handcuffed the museum's two guards on duty and put them in separate areas of the museum's basement. 
 
 No weapons were seen during the robbery and no panic button was activated. The video surveillance footage from the night of the robbery was taken by the thieves. 
 
 No one has ever been charged in the heist. 
 
 ___ 
 
 Online: https://www.youtube.com/watch?v=qSw1BsJEBB4
– The FBI hopes new surveillance footage released today will aid in the recovery of 13 priceless artworks stolen 25 years ago and help put to rest one of Boston's greatest mysteries. In the early hours of March 18, 1990, two men dressed as cops were let into the Gardner Museum, where they tied up two security guards and absconded with the artwork and the museum's security footage, the Boston Globe reports. But the thieves, who have never been identified, may have missed one key thing. According to the FBI, surveillance footage from the day before the robbery shows a security guard letting a man into the museum—against protocol—through the same door later used in the robbery. The Globe reports it's unclear why this footage wasn't viewed by law enforcement earlier, but it could show a "dry run" of the heist. The newspaper identifies Richard Abath as the security guard in the footage, and the FBI is hoping the public can help identify the mystery man he lets in. Abath, a rock musician at the time who now lives in Vermont, has claimed he had no part in the robbery, but this new footage appears to contradict a number of his statements. No one has ever been charged with stealing the art—for which there is a $5 million reward—and no one ever will, as the statute of limitations has expired. Someone in possession of the paintings, however, could face charges. Their total value exceeds $500 million, reports AP.