I just read this thread and maybe I missed something, but something seems odd to me. You said you contacted Ebay to file a complaint, and they closed his accounts, and through that process, he got your name, number and address from Ebay? And all you got from Ebay was his IP address? Something is wrong here. I have filed complaints with Ebay, and they give me the info on the person, including his address and phone number so I can contact the person directly and try and resolve this thing. You must have that information. If you haven't contacted the police now and give it to them. Document everything, including printed copies of the craigslist ads.
1999 SSE. 108K. Cleared Corners, Mobile 1, Energy Suspension endlinks. Ported and Polished LIM, NGK TR-55 Sparkplugs, 180 drilled Intense stat, Flow matched injectors, Intense FWI, Intense PCM, MagnaFlow Cat.