This last weekend, I grabbed all the Travel Bugs and Geo-Coins from my wishing well to take to my wife's 1K event to move along, however when I went into the wishing well for them, this one was not there. It has likely moved on with one of the recent visitors to my cache.
I have marked it as missing, so it does not show up in my cache's inventory.
Best wishes to your track-able, hopefully it gets logged soon by whoever picked it up.