Donations. I expect until recently the museum accepted donations of thousands of items at once. Some old private "cabinet of curiosities" or hobby collector's h

Donations. I expect until recently the museum accepted donations of thousands of items at once. Some old private "cabinet of curiosities" or hobby collector's hoarde would be transfered - and nobody would particularly care for any but a few select items at that time. So quickly a backlog builds up, which nobody particularly cares to clear, even now.