Contact USPS office of investigations, this is a federal criminal offense, and these guys don't take it lightly. Check out here: https://www.uspsoig.gov/about-us/office-investigationsWhat carrier did you use for shipping? If you shipped by USPS, then here you go...
United States Postal Inspection Service - Mail Fraud Complaint
You could be sitting on a slam dunk felony mail fraud case against this guy. If by another carrier, the fact that he used a fraudulent USPS Money Order may still give you standing to file a complaint against this guy, so it wouldn't hurt to try.
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