I have a coop with 12 nesting boxes my chickens are 7 months old. I have 10 silver laced wineadots one red sex link and one silve laced rooster. All my hens lay in one box I get 10 to 11 eggs a day all in one box. My chickens free range i let them out in the morning and when they need to lay they go back in the hen house and lay in the one box then go back outside. It is not a problem just wondering why they all use the same box.