Those ferrets are a cute bunch. Glad everything worked out ok.
Years ago my BP escaped from her Exo Terra. Those tiny knobs can be hard to lock when you are all thumbs like me. After that incident I was major OCD on checking those locks multiple times even if I didn’t even open it up for that day.
Though I no longer have tanks, I check every single enclosure before I leave the snake room, even if I only opened one cage