One benefit of working for a company that keeps sensitive records is that we have a file room with large metal shelves with metal dividers and metal cranks to move the shelves around.
One benefit of the 21st century is that this file room is pretty much empty (except for a small stash of office supplies on one shelf) as all those sensitive documents were digitized years ago.
One benefit of the pandemic is that everyone is working from home and the office is empty - you can bang on things and generally be a nuisance without bothering anyone else.
I had to go in to do take care of some things in-person earlier this week and spent some time banging and crashing the filing shelves together and recording the resulting noises. It just dawned on me that there are probably a lot of great places to capture some field recordings that would normally be impractical.
EDIT: In the spirit of sharing… (sorry for crappy recording quality, recorded with an iPhone)
Some short clangs in the beginning, some nice ringing/reverberating at the 20s mark. Also, you get the freebie of the building ventilation (or maybe its manufactured noise for privacy?) at the end.