Scams are as old as time. The Internet has just made it a lot easier and faster for them to spread. Now we have the one from the so called world bank going around out here again for about the 3rd time. Just change the wording and try it again and seehohw many people will send their information to the scammers.
I like Randy's suggestion. You could also take the checks and hold the car until the checks clear and the money is absolutely in your account. If you told them that, I doubt if you would hear from them again.
Ron