You didnt have your tool "confiscated"! No, in the eyes of the TSA, you surrendered it and thus they have no obligation to you for a receipt or anything else. You gave it to them and they are free to do with it as they please.

Tim Leatherman IS a tool. I would file a complaint with the AG in your state and the state Leatherman is hq'ed. OR?

Gerber or Victorinox for me.