I only take cash in person.I have the marking pen that can detect counterfeit bills. If it is a deal where I am sending the item thru UPS, I have the buyer send United States Postal Money Order(s). (The kind you can only get at your post office.) I take the money order to the Post Office and they can determine if it is good. Very few of those money orders have been counterfeited, I am told.
Could you explain in detail how he scammed you of a few thousand if you still have your car? Did you send him money back?