Golf balls also work!If you don't have fake eggs, put 1 or 2 of the eggs they've laid into a couple of the nest boxes and leave them for 24 hours. At this time of year, they might freeze but for just a day should be ok. Instinct says to lay eggs in safe places and where one lays another will follow as its likely a safe place.
And of course someone post a hen who stole light bulbs and broodied them
