If you really want to annoy them, tell them you will only accept payments though PAYPAL.........

A total scam and I know people who have fallen for it.
They waited for 10 days for a check to clear and sent the item, but the bank calls at the 15 day mark saying NSF...
Tell them the price your asking + min $5000 for shipping and when the check clears the bank (min. 25 days) then you'll release the car.
Best yet, ignore it and you won't have a problem.