I will admit I have had snakes get out on 2 occasions in the 15 years I have owned snakes. The first time I was about 16 and fell asleep with my blood python and woke up to her gone... Yeah pretty stupid on my part lol. I found her about 10 mins after I awoke. She was under my bed in a duffle bag. I have been happy to say that is the only escapee I have had... well last night I had my adult male yellow belly in a tote for feeding. Well the fiancée came home crabbing about her day and he was left in there with his f/t for about a half hour. No biggy he doesn't always eat right away. Well going down there expecting to find him with his uneaten rat I open the bin. There is the rat... lol no snake. It took me about 45 minutes to locate him in the basement. I started along the walls because I would suspect they would feel safer moving along the walls. I ended up finding him in a box of old baby clothes.
Prepare for it to happen. Rather be safe than sorry. My animals are quarantined to the basement. There isn't anywhere for them to go that isn't accessible. I am proud to say I have never had one escape from there permanent enclosures.