I've written a bit of an article on what I've found to be the best nest box type for stting hens.
https://www.backyardchickens.com/articles/nest-boxes-why-do-we-make-a-sitting-hens-job-so-difficult.74389/
How old is Hershey?
Some hens just don't get the idea as @Sneebsey writes. Sometimes pullets (under 1 year old) fancy having a go but get bored and leave the eggs.
Sometimes they'll sit in one type of nest but not another.