Everyone's coop and birds are unique, so what I share, I don't offer as axioms or laws, merely some observations.
First, the nesting boxes for beginners get used more quickly and more often if they are positioned lower to the floor. Mine are just raised on a concrete block or two, That's it. Purely my experience, but the pullets don't "get" jumping up to lay an egg right away. I get a few who lay on the floor for a week or two, just because I don't believe they themselves even realize they are laying egg. Who knows what is in a chicken's mind. But with the low boxes, they catch on very, very quickly.
Second observation. A long time ago, I noticed that some boxes just never got used. I used to wonder why. I know they love piling up a clutch, I got that, but why build the clutch in one box over another? Many years ago, it dawned on me that my grandmother, who kept hens from 1890's in the 1950's and who was instrumental teaching me an awful lot about the birds, used to put a burlap flap or two over the boxes. Since most traditional hen houses face south, to maximize the sunlight and solar heating in winter, she used to say, "they like their privacy and some hens will "linger" for awhile". I remembered her saying that, so I experimented in making the boxes darker, and turned one away from the light, making it easily the darkest box. Sure enough, the next day or two EVERY hen in that pen laid in the dark box.
I re-oriented the same box toward the light and turned a different box away from the light, making it the dark box. Bingo. Every hen, within two days, switched right over to the dark box. Chickens cannot talk so they cannot speak to us about such things. We have to watch, observe and take note of what their behaviors are "telling us".