GUYS GUYS GUYS GUYS GUYS!!!!
Finally!!! I did end up cutting most of them per advice from a very trusted breeder, just in case. It seems like a few have used those holes and a few have made their own slits so far. I can't wait until they all come out!!!
Yes, that's twins!! (And a little fruit fly that must've made his way into the box when I opened it.. little jerk..)