You would be shock at how small a hole they need to escape and just how tiny a place they need to hide. Usually they are found in the same room the escaped in, often less then 5 feet from their cage. It's hard but try not to panic to much. You can try late at night sitting in the room very quietly and listen for him, that is how we found my sister's corn years ago, inside a dog treat box...under the dog treats... Don't forget to check high as well, snakes have been found on top of book shelves and behind hanging picture frames!