Scott I assume it's this card? Still confused as to how the card just got up and walked away. I would assume you keep your stuff in a safe location and you don't really travel with the your collection all that much correct?
I'll keep an eye out and an ear to the ground for you. Crazy question you didn't sell or trade it and forget? I know sometimes I do that thinking I still own something and go looking for it for 30 mins and then it dawns on me oh sold that a few years ago.
Bound to turn up check all the boxes and such could have slipped somewhere is my guess.