1:I would start with a final call to him stating your intention to use legal channels to recover your property.
2:A call to Chamber of Commerce and BBB in his area.If he's a legal business he's got a license.
3:If he's not a legal business then the local D.A.'s office...
If you did not get a receipt it could get messy as stated above meaning a drive and a front door confrontation...Good luck..