I would ditch any hide made of paper or cardboard as it WILL mold.
He only needs to correct sized hides., You can use cheap plastic mixing bowls OR chip bowls, as long as it is big enough for him when he is nicely coiled.. Not too tight or too loose. ONE he is hiding in IS too small.
You can busy UP the tank by putting in foliage and some one mentioned scrunching up newspaper into balls so it nearly fills the tank. They apparently like that too a bit.
I personally use tubs as it is far easier to keep the humidity up, and sterilite is making some very very clear ones now.
COngrats and good luck!
Carol