When we built the coop, we made sure we had plenty of good nest boxes and yet, for some reason, there are apparently shortcomings in the eyes of some of the girls. I try to keep by barn closed once the barn swallows have moved out but I do have to get in there once in awhile and, when I do, the mob moves in right on my heals.
As you can see, they've knocked over several bottles and such to make the corner more cozy. When they sit facing out, mostly they just sit awhile then move on. However if they get up,
Turn themselves around,
And sit with their backside out,
You need to come back later.
I'm not sure why the chainsaw shelf is better than a laying box, but I guess I don't think like a chicken!