I found someone’s AirPod in a book- in my room

I was literally just looking through my books and i see one of the books was slightly opened which was weird since there was nothing there holding it up- or so i thought; i look closer to see an AirPod in the book holding up. I was so confused for like 5 minutes, I’ve never noticed the opened book and i look at the pile all the time-very strange. I asked my family if they know anything about this but they said no. It seemed pretty dead so i tried putting it in my case but i guess its the old gen so it didn’t work.

Any suggestions what i should do with this or should i just forget it and move on?