My next to the last hatch I did I also had used two fridge eggs, both ee. I wish I had checked the air cells before I had put them in , but I didn't until 24 hours later and one had a real wonky air cell. (I would have chosen a different one.) Both started developing. The one with the wonky air cell was an early quitter, end of first week. The other made it all the way to lockdown and was rocking at day 19/20, but never hatched. When I did eggtopsy I found an ee/nn chick, fuly formed, in position yolk absorbed, no shrink wrap, no extra fluid and no idea what happened. I had only 3 that did not hatch, the other two I could hypothesize as to why, not that one.
