Scam. Sent check without coming to look at the car in person? Check will be returned bad within 3 weeks. If you send him your money, you will be scammed. Wait and see. Even if it is not a scam, it is not your problem.Keep your car and relist it. The others that were interested will still be if they are not scammers too. Don't deal with anyone that does not call you after first contact, offers to buy without coming to you, has special circumstances, does not give you a deposit in cash, wants to send extra $$ to you for shipping, will have a shipper to pick up.