"Generally nesting boxes are closed off to young birds - because they learn to sleep in them and later will poo all over the eggs. They either learn to roost or you have to put them on the roost each night when they are locked up in the coop for the evening."
So do you mean when we move our chicks from the brooder to their coop we should block off the nesting boxes until they are old enough to lay and just have the perches available inside the coop?