Earlier quoted context omitted.
The organization and data which is in that takeout is a complete mess of years of design changes from picasa -> photos, empty folders, duplicate date folders, hidden old crap from your Google+ account (like banner pics) which you can't see anymore to delete, just stuff everywhere inside those zip files. $0.02 if you ever have to actually deal with them, add time to first normalize what you unzip.
In all fairness, organizing old photos in general (especially scanned in pre-digital ones) is pretty much a horrid task in most cases. I'm dealing with it right now and stuff is linked to all over my hard drive, dupes in different formats at different levels of quality, limited metadata, etc. New stuff suffers from there being just so much of it--much of it repetitive--but at least it's in some semblance of order.
I'm looking for the script I used. I also have some tools that compare hashes and find duplicates.
You can google that stuff, or if you want to hire me to help, PM me.