I was trying to remember back that far. LOL I think the booties became toys, the babies had something to keep them occupied while they got them off and then played with them. We watched them figure out how to get them off. We used something called *I think* Humpty Dumpty booties which were really socks with a stretchy, fold down top and were cheap enough that when they got lost it wasn't so bad. Oh my, that was a long time ago.
Happiness is catching that dropped stitch while it's still fixable..