OK, first off, I am a really laid back guy when it comes to matters of trust and money, or whatever....My wife says to a fault..

I had a BBC at a machine shop for some "de tuning" for lack of a better term.
I had some .030" LS6 pistons removed from a set of rods and some forged flattops installed in there place, rotating assembly balanced, crank polished yada yada...
My pop picked up my stuff last week because I was working 12 hour days and just could not seem to get it taken care of.
Going through my parts last night I realize I did not get my old pistons back (I say old but they had about ten hours on them). So I called the machinist and left a message on his machine that I needed those back because I was going to hang on to them for my buddy who was building an E85 motor.
I don't get a call back. So I called my dad just to see if maybe he still had them in his truck, he said no, but he talked to the machinist this evening and he says he sold my pistons...........

What???
Have you ever heard of such a thing? I need to have more work done and he does a great job, but really? The pistons are worth about $250 in my mind, I know I paid $450 for them in 2001 and had them weight matched and coated which cost another $160....
How would you handle this?
I'm thinking he needs to build my daughters Toyota V6 for the price of "on the house", but now I have a trust issue....
How would you guys play it? Right now I really want to just write it off, but something inside me feels really wrong and the more I thought about it, the more pissed off I get.
Thanks.
GT