Raid,
I sent someone out of state several lenses to try out and then pick one or two, pay me, and then send the others back. This was a person active on an internet site with whom I had spoken with thru the site many times. Well, he kept everything and ignored my emails for a couple of months. I was lucky because I had police connections. A detective from my town made a call to a detective from his town and they paid him a visit that evening and simply asked him if he was running an internet scam of some kind. It really scared the p*ss out of him, because I don't know how he accomplished it, but he FedExed me everything back, perfectly wrapped and packaged and I had the items back in my hands a little over 12 hours after the police paid him a visit.