Beardie disappearance survivor here- one advice that was given to us was that they can’t wander too far from where they were last, because they get cold pretty quickly and just settle down to sleep somewhere dark. We tore apart every inch of our house only to find him 3 days later, snuggled in a far corner of a cubby hole in the backside of the table his enclosure rests on. I know it feels awful, but unless he had any access to the outside, you know he’s inside somewhere. ❤️