I love it! Reminds me of when I got my first ball python and was so obsessive about him! :D
Anyway - first :welcome:
I suspect, he just hasn't found his hides yet. Yes, I can see he's crawled all over them, but has he actually found the entrances and gone in and explored them yet? I think once he does, he'll start using them, the one on the right is a perfect hide for him - low so it will touch him from the top.
It takes a few days for them to get used to their new enclosure - right now he's just taking things in and I'm sure in a few days he'll be hanging out in his hides.
Looks like you've received a lot of good advice already! And he's a very pretty pastel, btw!