My older hen has been laying them about twice a week. She was laying well in the spring but stopped. For the past few weeks she's been spending time in the nest box with no results. I've found a few membranes on the coop floor, the contents eaten. Last night I went to count beaks and lock up and right under where Sasha was roosting there was a shell -less egg. It had broken as it must have fallen right out of her as she roosted. I scooped it up. No need for them to get a taste of fresh raw eggs. Don't know what's up with Sasha. She's getting layer pellets and has oyster shell available. She's at least 4 years old now I think. Maybe just a whacky older hormonal thing?