They have fake eggs/golf balls in the boxes. It's only two pullets the others r using the nesting boxes. It's frustrating that only two haven't figured it out.
An update: so far no more eggs in the run. My Welsummer is still laying in the poop tray, BUT I have seen her 2x in the cat litter nesting box. I've found one egg in it so far, so I'm hoping to start laying there more frequently. I moved it from the run to the coop.