I tried chopped straw and I found that it would stain the eggs. When the eggs are first laid, they are wet and the straw gets wet and leaves a yellowish stain. Does hay do the same?The substrate in the nesting boxes should be different from the substrate in the bedding. I use hay for the boxes and shavings for the coop bedding.
I also suggest you to make the lip taller. Chickens are happier if there is a thick layer of comfortable hay in the box so the taller the lip, the more hay you can fit in the box.
