This TB has not been in my Research Central cache since late July, 2016. I waited until now to mark it missing to give whoever took it a chance to log it. However, it's time to take it out of the inventor of my cache. Hope it turns up again, as several on mine have been 'LOST' for more than a year, and then get logged again.
Stumpy75
From GC.com: This Trackable has been marked 'missing' by a cache owner or site administrator. Trackables are marked missing when it is determined that they are no longer located in the cache they are listed in or in the hands of the current holder. Review the most recent logs on this Trackable to learn more information about its current state.