That was WAY too barren, even for temporary quarantine. BTW, you can use small clean cardboard boxes as hides for new snakes- for a tiny one, maybe a jello pudding box, or a cracker box. Just cut a doorway in it- & toss (& replace them) when they gets soiled. (& Put some crumpled paper toweling inside.) And that cardboard roll- just squash it flat so it has a closer feel for the snake. If you want to see a little snake having "fun" you can put a larger box in there- something way bigger than a hide- & cut multiple doorways into it, & fill it with shredded paper towels or crumpled clean soft paper. They love that stuff, & it's almost like "snakey-kindergarten" for them, but really, it becomes a "confidence course". They need stuff around to climb & explore or hide in- not an empty box. So what if you can't see them every minute..."boo-hoo"! Put the snake's needs first- you'll have many years to watch him, & when they feel secure (because they have hides), they're more naturally active anyway.
I know... You got me super paranoid about Mites... I overeacted..