Not laying in boxes, need help

Can you put something on the shelf to keep them from getting up there, or put another shelf on top of it that is angled?
Maybe the laying area is not tall enough?

 

We bought wooden eggs at JoAnn's, if you put them in the nesting box (you can also use golf balls, ping pong balls) it says to them LAY HERE. My girls have never lais anywhere else. My grandmother even used old white glass door knobs.

 

I had some hens that laid on a shelf...literally the width of the hen only....they kept falling down and breaking, finally I just removed the shelf. I then put fake eggs in the nesting boxes and they laid there. Growing up, my grandmother used to put golf balls in the nest..it works.

 

Golf balls worked for us too. Also, when the girls started laying we limited their "free range" time to only after 4pm, which was after the peak laying time....when they all learned where the eggs were laid we opened up their schedule slowly to allow full day free ranging....In the beginning though it was funny. Some girls couldn't make it to the boxes. I think they weren't good on anticipating when the egg was going to come out. We had this one chicken always come and tell us where the egg ended up (usually somewhere on the way too the coop). Anyway, all of the girls ended up laying in the right place.

 

I keep fake wooden eggs in the nest boxes 24/7. I occasionally have to wash them off but it encourages them to lay in the boxes. I even have goose size eggs it doesn't matter. Even though I have more than enough boxes they prefer to lay in the same box. I find all the eggs in one box and none in some of the others. What's up with that?

It appears to me you need boxes darker inside and bigger lip on the front to keep the bedding in.