MkIV13 said:
Registering on ebay, you have to have a credit card down to sell anything in general. A valid address has to match the credit card and Ebay checks out the credit card first before he will be able to list the item. If credit card was stolen and he used it. The owner would know about it when he/she sees the cc statement.
I agree entirely. The issue is the amazing amount of Credit Card theft/fraud present on EBay. I wish it were impossible to screw the system, but it's still less difficult than jimmying a car door open.
I've spent a good amount of time in car sales (licensed), and it's amazing just how much you have to look out for to truly cover your tail. The above posts are Very amusing though...
The idea of arranging a cash sale w/ someone else as the primary contact would be an excellent way to get ahold of the car. Take the VIN # And insurance cards you used to have to a Toyota dealership, have a key cut. You could go so far as to inform the local police that it's a repossesion on a negated finance contract for a free pass to remove the car from his possession unwillingly. If you were to bring the insurance/bad check/contract/bill of sale documents with you, even if you were stopped/arrested, you'd still come out clear.
Have him stop for lunch while test driving the car, tail them/ sit waiting at the location, hop in, and drive off. Have your friend hit the bathroom, and walk out the back to take the car you were driving with a spare key. Free and clear, you now have your car back.
Violence isn't going to be the answer on this one, as the theif will undoubtedly wind up owning the car legally after the lawsuit. Just get in, get out, no issues.
~Nick
Edit - I realize the desire to hurt him is very very large, but how much greater would it be to pull off the above, and see the look on his face as you drove off

I'm certain you can prove ownership - Hell, I'd almost be willing to assist you just to spite the crooked buyer. I'm sure you can find a great person in his area that'd love to help out. Best of luck again.