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I have heard that they are not territorial about the boxes (unless maybe if they are broody) and they just seek out a dark, quiet place to lay. Suppose that is why people put a fake egg or golf ball in there, to mark it as a "safe place" to lay an egg.
That is just my non-scientific 2 cents... probably wasn't what you were looking for though!
We have over 30 hens with 16 nesting boxes four rows up and four across. I will tell you right now there are favorite nesting boxes not all are used. There will be hens waiting to use a box that is currently occupied while 15 empty boxes are empty. It is not uncommon I will see 2 hens in the same nesting box. Our nesting boxes are 11.5 x 115 x 11.5 in size so they are not large once the pine shavings are placed in them.