At 40 days they look ok, some eggs will dimple faster than others and some not at all.

One of the key and I have said that for years is to stop messing with eggs and people just cannot help themselves, no opening the tub no taking them out, every time people do moisture gets out.

Eggs do not need to be aired out before the very last week of incubation and only every other day if at that.

I have actually hatch animals from eggs that were not aired out at all in 60 days and they were fine too.