I have 3 nest boxes for 5 hens. With either 1 golf ball and one fake egg, or 2 golf balls, in each nest, they were mostly all using the same box (except for one contrary hen who liked a different one).
This wasn't a problem, but I wanted to see what would happen if I tried something, so I took out the golf balls and put just one fake egg in each of the two less "popular" nests and nothing in the nest they had been using the most.
Now they are laying only in the 2 nests with the fake eggs, not at all in the one they used to prefer. So, it seems they like to lay in a nest that already has an egg.
Now I'm going to try to see whether they prefer wooden eggs, or golf balls. Will report the results here.
BTW, I like the wooden eggs I got from here:
https://www.meyerhatchery.com/productinfo.a5w?prodID=WECR I got their "brown" ones, which were actually a slightly greenish taupe with dark speckles. The good thing about them is that they look very different in color from the (various shades of brown) eggs my hens lay, so there is no mixing them up with the real thing.
(Note: I have no relationship with Meyer Hatchery except as a customer.)
Friendly greetings to all,
Poppy