--- Assassin 39-s Creed Origins Save Game Level 30 Codex ((link)) -

The folder IDs ( 3539 and 4923 ) are specific to Assassin's Creed Origins and are consistent across installations. However, your UplayID or SteamID folder name will be a unique string of numbers and letters, so you may need to search within the main savegame directory. If you don't see these numbered folders, look for others with similar names.