I would suggest you stop listening to the pet shop people, most pet shops have NO CLUE when it comes to careing for animals (not saying all but alot are like this). Some Balls are different than others, some will be out and about more and some will hide all day until they decide to come out. Just relax and feed once a week. Its still adjusting to its new home, give it more time and youll see him out. Good Luck