Not too surprising, since the thing's been trying to escape ever since I bought it. It just doesn't quite grab onto the finger - at least not for very long.
I was concerned, not so much because of the loss, but because the thing has sharpish edges, and I was worried that someone would step on it. But all searches for it failed.
When I went out to the laundry room today, it was sitting there on a shelf.
There are many prosaic explanations as to why it would be there.
But I'm just going to assume that it decided to come home after a short, and I'm sure eventful, vacation.