Nibblerama

This sort of happened to me. I was running an emulated version of a popular MMO and the feds raided my home, took all my computers and seized my bank accounts.

This happened years ago, I was never charged with copyright infringement or money laundering for the donations I collected... but I also never got any of my stuff back.

Question is, if I was never legally charged with a crime, does it still give them the right to seize my things and never give it back?