Who steals bag tags, and why? It couldn’t have fallen off.

I had just received my Star Alliance 1K tags from United and, having lost many previous luggage tags, I added a sturdy cable tie to the wimpy strap provided by the airline. I attached one tag to the bag I check and one to my roll-on. (Yes, I realize I’m a little OC.)

It was my first trip with the new tags. Bob and I flew from Phoenix to San Francisco, then on to Monterey. Both flights were on small aircraft where I was made to give up my roll-on plane-side. In San Francisco, the tag was still attached. When I got my bag on the Monterey tarmac, it was gone.

No “equipment” had handled the bag; only humans. It was lifted onto the plane, then taken off. I can’t see how the tag could fall off or break. But who would steal it, and why? Does it have value on the black market? Or did someone want a souvenir with my name on it?