Most often, BP's are found within 10-15 feet of their enclosures. Start your search where the cage is, and very slowly work your way out in wider circles. Check every possible nook and cranny, every crevice and hole. If it seems too small to possibly allow your BP to get in or through...check there! They have unbelievable abilities to squeeze through/into the smallest spaces.

Use a flashlight and carefully check behind every drawer and under every piece of furniture...inside every shoe...behind the toilet (seen pics of a BP crammed into the narrow space between the toilet tank and the wall!)...in or around anything warm like a computer tower or appliance. And I've heard many stories about someone turning a room upside-down/inside-out and not finding the snake...doing it again....and on the third try finding the snake behind a dresser drawer 4' from the cage....just to help you realize how easy it is to overlook them when they're really trying to hide.