Cautious about this Craigslist offer...Help?

I bought an STR-15 for $400 off craigs. I didnt even own a 383 at the time but I saw a chance to own one for maybe a future build. I called and sent the guy a USPS money order for $30 over to cover shipping. Nothing ever got sent, his "roommate" forged sig and cashed it for himself (yeah, right) but the USPS M/O saved my *** on that. 5 months later, I got my money back BUT it took the sig of the original payee (victim) to process the forgery report so if the other guy doesnt want to play ball, it could have been much worse. Bigpowerstang and Don Joslin are on my **** list for life. Funny how you remember that stuff.....
Here is a tip. If you see something you absolutely need on a nationwide craigs search, call the guy and ask him to list it on Ebay for his fixed price, then send you the link. Its legit after that, works both ways.