very early eggs are often on the floor, when they understand more, they'll seek out someplace that feels.... cozy, like a box, that encloses them somewhat. Also, try marking an X on an egg or two, (after you enjoy the early ones! YAY!!!) and leaving some eggs in them too along with the golf balls. I find that you don't have to do it in every box, just one or two. Also, I put a hen in a nest now and then, (assuming they're comfortable with being picked up) and placing one IN a nest, they usually shuffle around and seem to think about it a bit, maybe it helps, maybe it doesn't.. heh, who knows? They're bird brains!
I just had a first time layer act all weird this AM, almost sickly, but not really... Everyone left the coop as soon as I unlatched the door but her,,, I came back to check on her an hour or so later, and there was an egg on the floor and she was out with the rest. Mine normally use the nests, but I don't think she knew what was going on yet!