First, hearing peeping from inside an egg is the most surreal thing I've ever heard! Second, I'm not worried yet, as I just heard them peeping and know they weren't peeping this morning, but how long is it safe for them to be in their egg peeping away with no external pips to allow more air in? Sounds like we have two live ones in the nest! The other three have large air cells while the two peepers were solid black before lock down, so I think the other three are quiters.