Hi, sorry it took me a bit to see this post. I have TB12, and it's duplicate, in my possession since purchase very long ago. I pondered releasing it to be discovered at events I host or attend, but have just never done so. Maybe someday. I reached out to the cacher that logged one of my old TB's. He said he was trying to complete a challenge for discovering 1,800 trackables. He wrote a program to try random numbers until he had enough to complete the challenge. Kind of lame, but makes sense, I guess, since it's impossible that he ever saw my trackable.
Thanks.