Sorry to hear that. One of our BPs got out while a friend was snake-sitting for us. I have NO idea how long she had been out for but when we got home she was gone. I found her within 5 minutes. She was two feet away from the rack under our ASF colony shelving unit. I've had one other BP escape (a longggg time ago) and he ended up in my bed which was right next to his cage. So, from my experience look close to his cage, or in the same room. If its cool in your house he probably didn't get far. Good luck and hope you find him soon.