Very convenient timing for me. I am currently prepping for a collection move myself, so I'd also be curious to hear what folks have to say.
As far as the prep work goes, I wrote a little Flask app that can take a URL related to a location, show all containers that are assigned to that location in ASpace (across all repositories), and optionally reassign a selected container to a different location:
https://github.com/Ukrainian-History/ASpaceLocs. The idea is that each real-world location can have a QR code attached to it containing a Flask endpoint URL that can be scanned with a smartphone and that will then bring up the app. It has no documentation at the moment, but if there is interest, I can see if I can make it more useful for folks. Maybe I'll foist the documentation writing onto a bot...