I cleaned out my brooder yesterday as I've merged everyone together. I had had problems with feather picking and such so I put a bunch of varying sized boxes in there to give them something interesting. When I was cleaning them out yesterday I lifted one box to find a huge hole in the bottom of it. Those sneaky hens put a hole in the box, filled it with shredded paper and had been laying in it. There were at least a dozen eggs in that nest. Very clever of them!