I have never considered it. I always believed it to be a behavior issue. There are social issues we are not aware of etc.
I think part of the trick, is that the laying boxes be the most ideal laying space in the enclosure. If they can have a dark secure place to lay on the ground, they will often prefer it. The nooks and crannies that you describe might be as preferable to the birds as the laying boxes provided. If there are spots they see as good as the boxes, they may choose other than the boxes.
I have come to prefer my nesting boxes to be near ground level for this reason, and it eliminates some other issues like roosting in the nest box etc. If I site the nesting boxes near the ground, and hang a partial curtain over the boxes (making the holes darker than any other spot in the enclosure), generally I eliminate the problem.
Recently, I remade the mistake of installing nest boxes as high as the roost in a couple mobile pens. Now I have a ground layer, and a couple hens wanting to roost in the nest boxes. I will lose floor space by dropping them, so I intend to make the perch operable. Then I can close them in the evening until I have the habit broke. I am going to adjust the pen to let more winter light in, and hope to realize the hen choosing to lay in the darkest most secure place again.
I have never not been able to correct the problem, but it has always required changes or adjustments on my part. That isn't to say that every now and then I may find one on the ground, but very rarely as a habit. It might mean I need another nest box.
Thank you so much for this post! This answered a number of questions that have been brewing in my mind...and saved me from having to actually ask them.
