They may be to tall. You could cut it in half so the ceiling of the hide is lower. Or just put a good clump of moss and maybe it will hide under the moss.
As for the humid hide. I leave the moss in all the time but I only keep it damp during a shed. The rest of the time I will spray it real good and allow it to dry back out.
These are cheap, sturdy, and easy to clean.
http://www.reptilebasics.com/hide-boxes