I was just doing some grinding and could only find one arbor nut among the 3 dewalt angle grinders in the metal shop. I checked through the tupperware and a (very) brief glance around the rest of the metal shop space. Do they have a new home I just don’t know about?
It sucks that most of the nuts are missing. I feel that this is a problem as old as time. I tried when we were the old space to not allow threaded flap wheels. It reduces the randomness of what happens to the nuts. I’m going with the original suggestion about having a container for them.