Another way of thinking about the "nests" under the bushes: If that is where the girls start laying, you know where to look and do not have to begin a new search.
We have a little Banty who is very good at hiding her nest and then finding a better place once she's been discovered. Some of her nests over the past 2 years have been found only by watching her move around the acreage.
For a while we had her reset to lay in the coop, now she's back to the rosebushes. We leave golf balls and one real egg there... and hope she'll stick with this place. sigh.
FWIW, there are 10 layers, 5 nesting boxes 2 of which are never used. The girls are all on different timelines, some lay early in the day , others not until late afternoon/early evening... Good luck!