This isn't to contridict anything Rose said or to say it was wrong or anything, I just do things a little differently, and we all need different perspectives to see what works best.
I put the hole in the side. That way the humidity condenses on the lid and drips back down onto the moss.
I also leave the humidity box in there at all times. That way, they can regulate their humidity when they need it. I never have to bathe/soak my snakes, and their skin's always pretty.
3 of my snakes are in screen-topped aquariums. I never mist my cages or cover the top or anything, and I always have complete sheds, as long as I keep the humidity up in the box. It's a lot easier to keep humidity up in those little tupperware bowls than an entire cage.
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-Irish
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3.3.1 Ball Pythons