Restore your catalog from a recent (yesterday's) backup.
In recent backups there is still only this (seemingly) old catalog.
It is as if all edits and work in lightroom this week did not happen.
any other adive as to how to go back further into backup (recent) catalog?
I have no idea what happened, why you are seeing what you are seeing.
My only guess at finding the missing work is to look under File->Open Recent on both computers.
I do know that if you aren't making regular backups of your catalog file, and relying on synchronizing catalogs from one computer to another via the cloud, you are living very dangerously, and now you are possibly going to pay the consequences of not making regular backups.