I've had this happen 3 times to me, twice was my own personal fault. Came home from a night shift and opened the tank to check on my children's and must have gotten distracted and end result was when i went to bed 14 hours later I checked on them again and found the tank open. Had a panic attack but looked around the room which at the time had my computer in it etc. Found my male curled up around my computer, the female hadn't left the tank thank god.
Then another time, similar thing but I was going a late night feeding and just mustn't have shut my coastal x's tank. A whole day later found the door open and he was gone... again panic attack, but by this stage I had a hatchling rack and as I found my last escapee near heat I checked in the rack and there he was curled up on my baby darwin's tub.
Now the third time literally happened to me a week ago. Same children's as before, the male managed to open his tank the one day the lock wasn't on (can't remember why). I had been on night shift and came home to find it open and them both gone this time. My female has always been a picky eater so she is considerably smaller. After my iminent panic attack I looked around the room and saw two inches of tail sticking out of a double knotted plastic bag that was FULL of snake poo and substrate that i hadn't taken out yet. Had to cut it open but there he was looking at me. His mate, didn't find her for 4 days. And only did my accident. My thermostat alarm was going off and I came in to check and found my temps were too hot, so I removed all my hatchies out and adjusted temps only to have my partner come in an exclaim that I'd found her. I said no the temps were too hot and she repeated NO YOU FOUND HER! Turned around and there she was in the rack wrapped around the heat cord. Who knows where she went in the meantime, I turned my house upside down and was having a heart attack that one of my cats would get her. Lucky me and lucky snake.