My girls prefer their Tidy Cat boxes to the roomier Sterilite bins with a door cut into the side that I offered them.
I had seen Tidy Cat nest boxes online, but was planning to buy some official nest boxes from the farm supply. Then, two weeks early, my Golden Comet, Frances Myrtle, started frantically trying to squeeze into any tight space she could find, so I ran in the house and got one of my old empty Tidy Cat buckets, and I helped her go in it. I didn't have time to cut the lid flap off. She went in and out a few times and then laid an egg in the run. Lol. The next day she laid her egg in the Tidy Cat box.
But to me it looked too small, so I bought a couple of small plastic bins that I had seen being used as nest boxes by a homesteader on YouTube.
Frances Myrtle went right into the roomier bin and sat there, but when she got close to laying the egg she jumped out and tried to squeeze between it and tbe wall, so I realized she wanted a tighter space and put the Tidy Cat box back up for her. She immediately went into the Tidy Cat box and laid her egg, ignoring the larger bin.
I gave them a choice and they all liked the Tidy Cat boxes best.
Then I read an article about why smaller nest boxes are better. One reason is they have to stand all the way up to poop, so a smaller box prevents that and stays cleaner. There are other reasons that I've forgotten.
Believe it or not, when one hen is sitting in the Tidy Cat box another hen can squeeze in there next to her and run her out. There's enough room in there.
Google Tidy Cat nest box to see images of some nice nest box arrangements made with them.
I'm not painting mine because the girls like the bright colors, and they don't need the paint fumes.
Also, I've kept the lid flaps so that if I ever see a snake in there I can snap the lid back on and carry the whole bucket out with the snake in it.