Even display cases are pointless for anything other than weapons (admittedly all they are actually for) as even after closing the case, my items tended to reappear on the floor upon reloading.
Hell, putting things on shelves is much the same deal.
So is it safe to assume then that Bethesda has revised their placement system? Or worked in something similar to what they introduced with bookcases where display cases and shelves will use an inventory system?
If they expect what they're offering to work, then this is something that should absolutely have been polished for this DLC.