Sad to say, I don't know if your well-established TB will turn up again :( Or mine - I'd put a special one of my own TBs in the cache at the same time as Averna, Worldgate Monkey (https://www.geocaching.com/track/details.aspx?id=8874627). Released mine there, in fact - for its first three months, it had stayed only with me :(
The container I placed both TBs in last summer apparently went missing sometime within a couple of months after that. Container was replaced - and that one also went missing. The cache is now archived because its premise, as the CO posted tonight, is no more - there was a faulty light in the parking lot indicating where the cache was hidden and the light has been repaired or replaced.
Cache was in a not-very-busy part of a suburban office parking lot. Lot is by a reasonably busy intersection with construction work, although the cache wasn't right by the intersection or the construction. Parking lot also backs up to some residences. So an office worker there, neighbor, landscaper, construction worker, random passer-by, just about anyone could have removed it - and might or might not have looked inside :(
I hope they did, and I hope our TBs turn up again someday, but it may be a long shot.
https://www.geocaching.com/geocache/GC9QDYD_blink-and-youll-see-it