It sounds like he's still pretty new to you, in addition to being young. Part of getting used to a new environment is coming out to explore it. It could be curiosity about the new digs, or it could be that it's still just unfamiliar and he's trying to escape the strange place.
Ball pythons actually are not pet rocks. They do come out to poke around, and are most likely to be found active in the evening and morning (although occasionally they'll wake up other times too). Part of coming to a new house might also be getting adjusted to a slightly different photoperiod because you turn your lights on and off at different times of day than his breeder did.
And it can take them surprisingly long to get used to new things and new places. So be patient, it's not surprising that he hasn't settled into a regular routine yet.