I am no expert with Mexican Black Kingsnakes. I have had 3 snakes in total get out. One was a corn snake, she was found on a book shelf, between the books, less then 4 feet from her cage. Also had 2 BP's get out, both of them were found under my radio/amplifier, so its warm, less then 10 feet from their cage. Slight history, I live in a 100 year old house with lots of hiding places.

I wish you luck with your search.