I guess one finds these boxes at various places:
Boxes at photo shops where (typically old and used) stuff is literally dumped in which cannot bring up decent money anymore.
The issue I got with those boxes is that if stuff had not already been worn out at the outer it will be soon in those boxes. Making boxes with dividers will need more space or more inventive and expensive designs.
But there seems to be another aspect, as one dealer told me that customers looking for old stuff bargains would not except an orderly assortment.