A man in a wheelchair rolls by a porch and sees some money there. He can't reach the bill from his wheelchair so he stands up and climbs the steps to get the money. Then the camera shows Derek sitting on a chair observing him. He was sprung as a fraud. But before the scammer in the wheelchair climbed the stairs he looked all around the place. Doubtful that Derek would be able to sneak the chair in there and sit down before he was noticed.