If you really want to scam him, try to trade him a "used rolex watch" and cash boot. Tell him the cash will be inside the box with the rolex and you're going to mail it to him. He should jump on that cuz the rolex alone would be worth more than the asking price for the car and cash boot would be icing on the cake. Then stuff as much worthless junk as you can in the box. Preferably heavy stuff. Make him pay COD for it. He'll spend a **** ton of money getting your heavy junk from the delivery service and will have received only junk. You have effectively scammed the scammer.