It seems that someone has picked this up without logging a retrieval. Dang.
I wish folks wouldn't discover travelers as they are supposed to travel and just languish in a cache. If you have the time to log "discover" you have time to retrieve it and drop it in another cache down the road. Trackable owners would appreciate it. After all, there isn't a geocacher on the planet who looks to see how many trackables you discovered. :))