[tephra]

The British Museum have somewhere on the order of 8 million objects. Having been collected since 1759 (and indeed before) in various state of being catalogued correctly at the time of collection.

The collection has survived new buildings being built (a time when stuff easily gets misplaced) and of course the ebbing and flowing of funding.

I would say that keeping that large of a collection of such a long time completely in order is a hard problem.