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I can see the logic in this, but don't know how much of an issue it might be. Doesn't chicken feed already have a certain amount of calcium in it anyway? Feeding back chicken shells will help supplement their calcium intake. But if you still notice signs of calcium deficiency you could then go buy a bag of oyster shell, or give them some dairy.
I usually throw eggshells in with the compost, but if I'm making some dish using lots of eggs at once, I'll dry & crumble the shells to give to the chickens. I'll also do this if I notice thin-shelled eggs are being collected from the nests. And sometimes I'll scramble eggs with their shells in the blender & cook for the chickens to eat.
I don't mind the little bit of extra work, and am willing to do it on the remote chance that some chicken might otherwise be inspired to eat eggs from the nests. I also want to avoid having any leftover raw egg residue spoil in the hot Fla sun, and/or attract more vermin.
But as you see, it might not be necessary to take those extra steps.