Hello, I have read previous threads on this subject. I use pine shavings, hay and a hay straw mixture as bedding and coop materials. I have a hutch off the ground which has a run under it as well as 12 feet in front of it, covered. My 6 nesting boxes have a slight lip and are sectioned off. The birds keep kicking everything out of the nesting boxes onto the pullout board. How do I deter this since they could lay any day now and I do not want broken eggs, Suggestions??