I have 12 hens and 2 nest boxes. 1 box has 2 nests, the other has 3. They use only 2 boxes. May be different boxes on different days but still only 2 nests heve eggs @ the end of the day. I have seen as many as 3 hens on a nest @ one time. Whether they lay one by one or together they only use 2 nests. Why? Concerned because to this causing @ least a couple broken eggs daily and sometimes more.