Shrinkwrapping isn't an instant thing. Just make sure you put a pipette or dropper full of water on a paper towel into your incubator the moment you open it. This will bring the humidity back up very quickly and dry out quickly enough that it doesn't add to the overall humidity.
You can take...
It's only day 16. Don't worry. In my experience, the first one to pip is never the first one to hatch, and usually sits for more than 24 hours before zipping.
If you're worried, try gently tapping on the egg next to your ear. You should hear a response. You can also try candling.
I have a pair (they're actually my roommate's now) in a plastic bin that I converted to a brooder and is now a button quail habitat. This picture is from when it was a brooder. Now it has fake plants and little boxes for hidey holes in it.
In that heat, have your incubator up and running so you can pop the eggs into the incubator as soon as you get them. That way if they've begun to develop, they'll still be okay.