a hiding ball is a happy ball.
take a deeeeep breath. this part is the most exciting and least stressful, because it's hands-off and allowing the snake to adjust for a few days. enjoy the excitement of a new pet (that you can't see yet)!!! google snake photos and think about your first handling session together; it's going to be exiting! when i first got Yellow, i would be so anxious to see him i couldn't sleep knowing he might come out at night.
only thing i can judge about health from a photo is weight: Axel looks skinny, but nothing a few meals can't fix.
wait until thrs to offer food.