My egg eater is an Easter Egger, so I guess that makes her a EE EE. She only eats eggs that are different than hers, for some reason. Since she has those cute muffs and beard, it was obvious that it was her from the very first time. In her flock, I have 3 greenish/blue egg layers, a brown egg layer, a dark brown egg layer, and a small light brown bantam egg layer. The only eggs that are ever eaten are the regular sized light and dark brown. The 2 girls that laid these eggs were on the bottom of the pecking order as chicks but once they started to lay, they moved up to the top, and took over my EE's spot. So, I don't know if that has anything to do with it but I find it interesting. To help this problem I check the nest multiple times a day, especially looking for the brown eggs. The last time I caught her eating the egg remains, I was persistent with not allowing her there while I cleaned it up. She was extremely upset and fussed the entire time. I have also noticed her being a nest box bully as well. She is very rude to whomever is trying to lay, and it's not because she's anxious to use the box. She doesn't do this to the girls that lay the eggs she eats because they're above her in the pecking order so she's afraid. If you made it this far into my forever babbling, I just wanted to share my experience. Best wished with finding your culprit and whatever you have to do to solve the problem.