There’s a dive site I visit where a lot of students train, we are always finding weights, weight pouches, knives, snorkels............ When we dove under the bridge we found a weight belt but we left it there, we already had other problems.
So I’m sure someone has found your’s or someone else’s and put it on Ebay, the problem is they probably don’t know it’s ScubaPro or that it’s from a Bella so you’ll need to widen your search. Good luck!