Me personally I would be looking at a lawsuit unless they gave you some money or something back in turn. Cause there is no reason they should have given you a core for something that they lost. Thats just me and not knowing the complete details.
How much are you wanting to get out of the engine? Injectors included?
I'm asking $5500 for engine complete with injectors. What can I say about the turbo.. I called talked to a tech that worked for him he looked at it and said he would get back to me in a couple of days after they tore it apart.. He never called back and I called and called and could never get anyone on the phone. I actually figured they were going out of business and that it was a lost cause.. Finally after calling and calling they sent me the used core turbo because they don't know what happened to mine..