I introduced 5 pullets into my coop after 2 of my hens were killed by a dog. However these pullets are sleeping in the nest boxes. I have seen them use the perches through the day and because i keep them on someone elses land i do not see them at night, however due to the mess in the boxes i'm pretty sure they are sleeping there . As a result my remaining hen has started to lay ouside instead of in the boxes. Is there any way to get the pullets to sleep on the roosts at night?