For the hell of it, contact GM customer service. Tell them the story and you never know, they may be able to assist your friend.

I work for Mercedes-Benz and we recieved a letter from a customer regarding a hit and run... parts were found on the ground....they contacted us for help....our customer service rep worked with the parts division .... they tracked who ordered the specific part... and caught the bastard!

I shortened the story.... but you get the point

hmm never thought of that! Thanks!