This may be just a confusion of terminology?
Usually when people around here say 'nest box' they mean the little, usually something like 1' square or not too much larger, box that the chicken goes into to lay its egg and then leaves.
Is it possible that broe is talking about the whole indoor *coop*? Which usually contains one nestbox per 3-4 chickens, plus a roost (somewhere distinctly higher than the nestboxes, so they don't sleep/poo in the nestboxes), plus open floor space, and sometimes the waterers and feeders are kept in there too.
You really really don't want them sleeping where they're going to lay eggs -- it makes for extremely pooey nasty eggs.
HTH,
Pat