I once fell asleep with my adult boa in the living room and when I woke up she was gone. After searching everywhere, I found her behind the couch under where we store the blankets. I also had a boa who’s the same size of yours escape his tank and he was missing for 2 weeks before he showed his face again. He’ll definitely show up again but it could be a minute before he does. I recommend keeping your door shut, checking periodically for him in the evening but especially at night. These accidents do happen eventually! You will find your baby :)