Finding orphaned media?

I’m working on a textbook and an associated user guide using PressBooks. I’ve uploaded >600 screenshots before realizing that I need to keep track of media versioning and use a clear naming convention.

So, is there a way to make a search that identifies for all media where (and hence also if) they have been referenced in the given PressBook?

The media description gives the pages it was uploaded to, but does not know if a newer version has made it an “orphan”, i.e. a file with no “parent” link in the book.