I feel compelled to mention here that archives and libraries aren't the same thing. Libraries do (or should do) collections management, whereby the librarians

I feel compelled to mention here that archives and libraries aren't the same thing. Libraries do (or should do) collections management, whereby the librarians go through the records and find out which resources aren't being used and weed them. Ideally, if it isn't used, it's taking up space, and it's gone. This is balanced by acquisition, such that the net effect is a constant churn of what's there, so there shouldn't be much chance for anything to sit and molder where nobody knows where, let alone what, it is. Archives don't do collections management of that sort. They do preservation, and ideally they never get rid of anything. Moldering (in a metaphorical, but hopefully not physical!) sense is very possible in an archive.