Well, it _was not_ in the mudroom area. We went through the whole thing. I was convinced it was either up (in the master closet) or down (in the basement) or possibly through the wall (the playroom), altho none of those places had as good a signal. We finally turned to the pantry, where we found the fitbit in the battery bin.
What was the fitbit doing in the battery bin?
We _suspect_ that T. had so much fun playing hide and go seek the day before that he wanted to play again. Alas for T. (and the rest of us), once I get involved in hide and go seek, no one has any fun ever again. I don't anticipate this ever happening again.
If he'd _asked_ to play this game, I might have been willing to play. Maybe.