With just 4 hens you really only need 2 nesting boxes. Thought I'd mention that just in case you need to make more room in your coop...4 chicken about 5 nesting boxes. maybe it can be they need curtains. Other chicken hop in the box and check to see what the fuss is all about lol. but they sit in and move the hay make loud weird noises and then the leave and act like nothing happened lol