Seriously, if you want something back from somebody here in the USA, here's what you can try:
Explain the situation to a private investigator and ask for thier advice.
Sound simple? The catch is that this service can run $100-$200+ easily.
PIs still really exist here, and they are very effective at property recovery within the boundries of the law. If you have a good case, it could be as simple as a PI showing up at the guy's home or place of work, and in front of his coworkers asking to speak with him about about the property dispiute. People *really* don't like this type of confrontation/exposure in front of family or coworkers.
PIs tend to be retired police, so they have a very no-nonsense and slightly menacing demeanor, and they know the law well.
Somebody like this:
http://www.hensoninvestigations.com/About_Me.html...and he takes PayPal. How easy is that!