The City of Columbus radio administrator is the only one likely to know anything, or whomever is managing syswatch on their system. That is the person you need to talk to. Be forewarned. Unless you are absolutely certain as to the heritage of this radio, and are absolutely certain that this is a legit sale from them, you run the risk of losing the radio and your freedom if you contact this person, as they ARE the person who bricked your radio.
If they legitimately sold it, then they should gladly take it in, unbrick it and unprogram it from their system. Leaving it active on a PS TRS is simply stupid. If it is missing and came up in the DB as missing/stolen, then they certainly WON'T unbrick it, and you will be answering to LE with some pointed questions at the very least.
I find it extremely unlikely that a current (but older) radio would be surplused unless there is some major upgrade going on, in which case there should be many more on the market at this point.