I had downloaded Enpass from the Apple Mac Store.
I checked the folder you mentioned above on my 2 external disks, but the 2 folders, Backup and Vaults, are also empty. I assume those were copied back to the internal SSD by the Migration tool.
What are the file names of the vault? I could do a search of the entire disk if I find the vault.
I don't use iCloud and I don't do backups from within Enpass, as I do several complete system backups using CCC to 2 external disks. So the vault should be somewhere on the external disk.
A while back I tried the copy to iCloud, thus, I have an older version there, but I would not want to restore it if I can copy it back from my backup disks.
Any other ideas where I could look?