There’s a few tips here in this link,it says one nest box per 4-5 laying hens. Do you have two nest boxes? There’s a tip about adding golf balls or wooden eggs to the nest to show it’s a safe place to lay,that’s interesting although I don’t have chickens 
https://www.mypetchicken.com/backyar...nest-H204.aspx

https://www.mypetchicken.com/backyar...nest-H204.aspx
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