I had a small piece of plywood propped up against a wall in the coop. All the girls started laying behind it, would have 2 or 3 behind it @ a time. So I took the wood laid it flat down on the ground. Instead of going back to the boxes they went to laying behind a 55 gal drum I have in the corner that holds hay. I don't mind. I can find the eggs. They are still laying them in the coop & are easy for me to find. Who says chickens need nesting boxes anyways?? They seem to think the ground is much nicer! I have been battling lots of snakes, guessing that is why the girls quit the nesting boxes. One day they will go back to the boxes, but for now they just don't won't too.