Every time I've checked instead of carrying on the plane, the tag has gone inside the case with the gun, actually with the gun. Without exception. I've always sort of expected them to put it on the outside of the weapon case sooner or later. Hasn't happened to me yet. I did check a duty and a personal weapon in one suitcase once flying out of Reagan Int'l, and they wanted to open my suitcase to look at a fingernail clipper sized glass breaker that we were given at Cheltenham (FLETC). Guns are okay, but a pointy thing isn't? Weird.
Did someone talk to you about your TPS reports?