IMO I wouldn't keep any juvinile snake in an outside enclosure, children's pythons need constant heat for at least the first 12months (or at least that is what I have been told correct me if this seems wrong) as andynic07 said also moving him around would be causing a lot of stress and not being able to be comfortable on one area because the keeps getting moved. It would be best to keep him in a click click inside with constant temperature with a thermostate, leave him alone for a week to let him settle and not be disturbed, present him with food, if he doesn't take it leave him for another week, because whilst he is outside you can't thoroughly monitor the heating that is being provided throughout the day. The main priority is that he settled and eating
Also, I don't believe the advice given to you from the person at the pet shop shouldn't really be taken into account with such a young python, both beardiies and carpet pythons need a lot of different housing requirements compared to a children's python, especially juveniles.