The police investigations unit for the city he lives in is a good start. Also, the FBI Internet crime unit is also another great place to file a complaint. Finally, since I'm assuming the USPS was utilized for shipping your goods to him, the USPS investigators might be quite interested in the details, too ... and, pinning him down. Keep in mind, it wasn't all the crime that the mob did that brought them down, but it was usually something petty like using the post office that got them into big trouble.
wje is right, mail fraud is taken VERY seriously by the USPS, maybe not a small time scammer, but from the looks of it, he's stolen at least $1000 worth of stuff