What to do?

O.K. my car has been at a friend of mine shop for the last year, He has the room and he lets me come down and work on it anytime that I want.
He doesn't charge me anything, but I give him a $100.00 or so every month to help cover the light bill. I went down there today to get my bell housing with the small hole for the transmission so could trade it to a member on here, he has one with a large hole and we are going to trade. We are going to pay to have each one shipped to the other and call it even. Now they moved my car and car parts and I can't find the bell housing or the trim for the back glass. We looked for over two hours today and nothing. What should I do?
Thanks for any advise. Gary