Personally, I've never seen the fuss over a nest box. Mine didn't lay in theirs, they've always laid behing an old cast iron tub, between it and the wall. It's not quite as easy to get to, I suppose, but all it involves is bending over and looking. I just keep shavings or hay down there to help keep the eggs cleaner. Since I had free rangers, I'm just happy they lay where I can find them!
The nest boxes we started out with are now out in the garden, little boxes of raised beds for strawberries and swiss chard.