I found half of a very small egg in the nest box. I am thinking if someone ate it they would have eaten the yolk not half of the shell. I have no idea who had the problem. I checked them all and nothing seems unusual. How much trouble could my girl be in? The yolk for the most part seemed out and some white was there in the box. What symptoms should I be looking for? They are eating purina layer ,egg shells and oyster shells offered. I have some 12 months old and some are 9 months old.