A beanie believed to have belonged to Luke Shambrook has been found on the fourth day of the search for the missing 11-year-old. Victoria Police have confirmed it was located on Monday afternoon, west of the Devil’s Cove and Candlebark campsite in Lake Eildon National Park - north-east of Melbourne. They are unsure when the beanie was dropped as the search for Luke continues. Scroll down for video . The Shambrook family with children (left to right) Luke, 11, Lauren, 7, and Matthew, 10 . Luke Shambrook was last seen on the national park at 9.30am on Good Friday. It is understood he wandered off and has not been seen since . Police remain hopeful they will find the boy who went missing from the campsite on Friday. An increased number of police and other emergency crews continue to scour the thick bushland areas around Lake Eildon. On Sunday, search co-ordinator Acting Senior Sergeant Andrew Walker said Luke had a 'very high pain tolerance', a factor that would work in his favour given he has now been missing for days. 'Hence the reason why we’re out searching. We’re still hopeful that we can find him,' Sgt Walker said. The 11-year-old, who is autistic, was reportedly seen walking near the Devils River on Sunday, four kilometres south of his campsite where he was last seen. Search crews have rushed to the location and police remain comfortable that the young boy is still alive. A Victorian Police spokeswoman told AAP late on Sunday a family saw a young boy matching Luke's description while they were driving in the Devils River vicinity. A renewed sense of urgency has gripped the search efforts for the 11-year-old as temperatures have been dropping as low as eight degree Celsius in the area. The Candlebark Campground in Fraser National Park, central Victoria, where Luke went missing on Friday . 'The advice I'm getting from our search and rescue experts having regard to the overnight temperatures and the daytime temperatures is that he could well still be out there,' Sgt Walker said on Sunday. 'We've got to be realists but we're positive, the family's positive.' But Luke may not even know he is lost and is known to frequently hide, according to his family. He was last seen leaving Candlebark Campground in Fraser National Park near Lake Eildon at 9.30am on Good Friday. A large search is being carried by a medley of search and rescue teams . Lake Eildon, near where Luke went missing: Police say conditions are favourable for his survival overnight, with warm temperatures through the day . Sergeant Greg Paul said the search was focused on an area of several kilometres of bushland . Campers are helping rescue teams including the air wing, dog squad, local police and SES volunteers in the search of thick bushland. Police hold hope Luke has been able to stay reasonably warm as he was last seen wearing a beanie and warm jacket. Having met Luke's family during a push to open a special school in Melbourne's south-east, Opposition emergency services spokesman Brad Battin says it is devastating to hear the 11-year-old is missing. He said Luke's parents Tim and Rachel had been updating him on the search and appreciated the efforts of all those out looking for their little boy. 'He's a lovely young kid,' Mr Battin told AAP on Sunday. 'He displays all the characteristics of a child with autism, which means he might not even think he is lost.' Searchers are desperately combing bushland and the banks of a lake for an autistic who went missing there . A widespread search is being carried by search and rescue teams including the dog squad and local police . Sergeant Greg Paul said the search was focused on an area of several kilometres of bushland. 'We've got a lot of searchers in the bush, we've got a lot searchers searching all the tracks and in between the tracks and the gullies and the spurs,' he told reporters on Saturday. The Shambrook family has thanked emergency service workers, volunteers, family and friends for their help. They say the disappearance is completely out of character for him. Luke is described as being of medium build, about 150 cm tall with olive skin, brown hair and brown eyes. He was last seen wearing a black windcheater, black t-shirt, grey track-pants, grey boots and a scarf.
Luke Shambrook was last seen leaving Candlebark Campground on Friday .
There has been an unconfirmed sighting of Luke with police acting quickly .
The 11-year-old was reportedly seen walking 4 kms from his campsite .
Police remain hopeful they will find Luke, who has 'high pain tolerance'
Luke has limited speech and his family says he is probably confused .
A large search is being carried by a medley of search and rescue teams .
Police also said conditions are favourable for his survival overnight .
They have issued an extensive description of Luke and his clothing .