There was this guy in corvette forum while ago that did this to 3 people I believe. It turns out later that he also did it to Camaro boards and some other ones. The victims that time teamed up but I cannot remember any further details but the sheriff of the local area was going to help. I remember though the address turned out to be an old porch of an unoccupied house.
Do you know the address? Did you track down the phone number if you do not have the address? I think you should take some action immediately with 1RandyC. This guy maybe doing the same trick to some other innocent people on another board.

 

Would this work in your case?

http://www.fbi.gov/interagency/ifcc/ifccoverview.htm

I hope this is works.