REPRODUCTION VIN... WHAT TO DO??

The Facts that he knows so far are. 2 owners ago sold the car with out a vin to a guy, that owner had a reproduction vin plate made and put that in the car. Then my buddy bought the car with a vin in the car. Actually I do have pictures of the vin and hidden vin on cowl, but as of know I can't post them until my buddy figures out the course he wants to take. He spent good money on the car and I think he is getting more pissed as time goes on. He has a hard time letting things go. I say drive it and enjoy it!!!