My hens have just started laying. Only two eggs so far. But both of them have been on the floor. Will the start using the nesting boxes by themselves eventually, or is there something I should do to encourage them? I have 6 nesting boxes, all in a fairly standard size I believe. They are raised from the floor and are lined with hay. Should I use something else than hay? I otherwise use pine shavings in the coop. I have a fairly thin layer of hay, should I add more? There are 5 hens and 6 boxes so plenty to choose from.