Every so often I go to let my chickens out for the day and one of them has laid an egg on the floor of the coop. I have a few who lay their eggs before it gets light, but they all lay in one nest box with another one spare. Once every few weeks their is an egg laid on the floor in the middle of the coop. Why doesn't she lay in the other box if one is full? And isn't the middle of the coop a bit too public for her?