I think the same thing may have happened to my G Shock watch a few years ago. I was working on my Jeep and had to remove it to get my hand in a tight spot. I know exactly where I put it. Next day it was gone. It was a very hot day and I’m guessing the salty sweat had some appeal to a critter.
In the past week I've sealed some cracks in the (bed)room so to keep them out. However, I think I may have inadvertently trapped one or more inside! And now they're going nuts with hunger. Because they don't seem to care much anymore if I'm there or not when they climb and jump around on stuff. As I mentioned earlier, the day before it happened, one actually hopped up on the bed, paused a second and looked me in the eye.
When I first read this line, for some odd reason, I read it as "G-String". Lol!