How many times have you been ripped of in a car or parts deal???

I contacted his local sheriffs office and they wouldn't do anything. I had a nice member here willing to stop and get my parts but I didn't want any issues to arise for the member.
I don't get it. How can someone take parts you provided, then build an engine with them and sell it, and have police do nothing about it? There's no difference in that and if he walked into your garage and stole them! Did you take pix before they were shipped, have a UPS tracking number, etc? Any sort of proof that he took possession of your engine parts? This is crazy!