Found this odd egg in the nest box yesterday. Looks like it tried to break internally but got recalcified. I know one of my hens has been having issues, super thin eggs that break in the nest box or shelless eggs. Havne't been able to figure out which one since they are all acting hllathy with bright red combs. They have free access to oyster shell and layer feed, plus they feed range all weekend and at least 5 hours a day during the week. 4 of my hens are about 3 yrs old, so I'm assuming it's one of them. The only one I'm sure it's not is the easter egger.