We have 4 boxes for 9 hens, which is probably more than we would need even when they are in peek production. They started out using only 1 nest, then we put porcelain eggs in the other 3 nest and now they use every nest in their coop. Seeing another hens egg in there seemed to do the trick to get them to use different nests. Now they usually lay in whichever nest has the most eggs at the time.