Oh I don’t give them the shell. I scramble them in a pan and just feed them like that. I won’t even do a peeled hard boil egg since it maintains the egg shape.
Some people crush up the shells and feed that in place of oyster shell for calcium, but I don’t take the chance on that. Mine have been good about leaving the good eggs in the box alone. If one breaks or someone randomly lays one in the run they will clean it up. But they’ve been smart enough to separate the two. I give 18 birds about 10lbs of mealworms over the course of a month so they probably feel content with their protein.