Not confused Old Fuff, I followed up your comments on the other thread with a lot of research on the Tiarht Amendment. And like you said, "if the gun is part of a criminal investigation". This gun was not part of a criminal investigation, it was found property, and no suspicion of criminal activity was articulated.
Now I will say I was confused originally, I didn't know what you meant or what an ATF trace entailed at the time. Now I do, and there are clear guidelines on when an officer can do a trace.