my 360 heads were stolen by machine shop

I find it really hard to trust people I don't know for exactly these reasons, even with identifying marks a shop can still make mistakes, or intentionally try and screw you. Having to go to the police, or take the shop to court, takes time and can delay your project. One of the things I really miss since moving were all the contacts I had, good people that I could trust and rely on to do exactly what they said they would, and at a fair cost.