Modify the humid hide so that they'll start using it; otherwise, you'll keep having problems. It might not even be a bad idea to put in two humid hides.
If you have the hole on the top of the hide, make a new one with the hole on the side so it'll be easier for them to find. Don't make the hole so big that they can't really hide, but don't make it too small for them to go in through. It's possible that the hide you have is too wet or too dry to attract them.
What kind of moss are you using? The petstore kind usually doesn't work as well as peat/sphagnum moss from a garden store.
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chickabowwow

3.2 leopard geckos (Rosie, Locke, Lisa, Caesar, Tommy)
and 3 eggs a' cookin' 