I figured it all out eventually.
I opened the package contents on my most recent back-up. I then inserted the working files from my previous library into the new library (the backup one.) Once there I was able to relink everything properly from their new location with their new structure.
I’m guessing the file structure for re-linking was wrong. I kept getting a message saying the file length, audio changes, etc. were incorrect and couldn’t be linked.
Earth without art is just Eh