Either the silencer was already there and the police didn't look far enough into the cupboard,,or DB had " put " it there,,to get it out of the way if it had been found that it was in possession of someone else. The fact that DB took it home instead of phoning the police straight away to come and collect it,,doesn't sit right with me. Your own common sense tells you NOT to touch anything before it's forensically tested,and above all taken from a crime scene.