I have 4 Cuckoo Maran pullets who should begin laying any time. I also have 3 laying hens who all use ONE of our 6 nest boxes. The pullets have never shown an interest in visiting the nest boxes (elevated 2 ft, with ladders). Will they find them on their own, or will they begin laying on the floor of the pen and other places? How do I get them to use the nest boxes?