Foot missing on this bowl

This bowl had a foot pop off during firing- I placed it on the bowl on the ledge so the maker could glue it on after firing.

I just came back in the studio this evening and the little square foot that was on the bowl is missing. Anyone know where it went??

I think I picked it up with my class pieces. I remember picking up a small piece I thought was part of the little cat or duck plate someone made in one of my classes. I’ll check when I get home and drop it off on monday.