The dead muggle criminals were disturbingly easy to get rid of and no one even bothered looking in the London crime reports to see if there were any suspicious deaths that could be linked the dark spell that is keeping Malfoy from talking. Finally, after a week goes by after the muggle police had found the bodies, she can't take it anymore and suggests they check the muggle crime reports in a meeting. Neville shrugs and says it's worth a look and it takes them three days to find the right report. Neville and Bartrum had dismissed it but Hermione made sure it was on top when Draco walked through. Of course the son of a Death Eater would recognize it for what it was.