Long before I was a member here I lost a cornsnake not a week after she was bought for me as a present from my family. Her lid had no give as far as I could tell but apparently enough for a tiny cornsnake to slip out. I learned since then that especially with colubrids you have to triple check lids and use lid locks.

We lost a female BP last year. One lid clip wasn't on tight enough and she managed to not only get out of her tub (we've since gone to racks) but get out of a closed snake room (she must have slipped out when the door was open during cleaning or feeding), down a long hallway, up a set of stairs and into our masterbedroom (the door is always closed but there's a slight space between the door bottom and the carpet that I can't believe she got under).

She was gone 4 months. We were pretty sure she was lost in this huge 100+ year old house we rent. One day my husband was going to bed after nightshift and noticed some books knocked over. Guess who was sitting on top of the pile of books LOL. We often wonder how many nights we were sleeping and she was happily slithering around our large master bedroom going back and forth between the two big walk-in closests.