Four days is a very short time, especially for a tortoise. They can take weeks to get used to new surroundings. Hard as it may be, don't keep watching your new friend. It's intimidating to him. Give him space to feel safe to explore and get used to his new home and he will start to be more curious.
Yeah...I figure I'm just being paranoid as probably most newbs are...but I just want her to be happy. I adjusted my ceramic heater a little. The basking is now at 102° and the cool still hovering around 80°