M.J. , darken the nest boxes by hanging some cloth or material in front of the entrance with a slit for them to enter and I know thy will. It will not allow the egg eaters to see the eggs.
Increase the protein in the diet, because that will satisfy them and they won't need the eggs, which are full of protein.
Dry cat food and black oil sunflower seeds are good treats with 30% protein. Collect eggs often to avoid hens breaking them in the nest, because any chicken will eat a broken egg.
Close watch on the flock is priceless.
bigzio