I use several of these http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=885&cmpid=01csent&ref=3665&subref=AA bins for nesting boxes. With my last broody hen, nobody attempted to use the nest when she got out for a break. I currently have two girls setting. One constantly has extra eggs in her nest. Would it be possible for her to get eggs from somewhere else into one of these bins without breaking them? Of course, she has to be the homicidal-ninja broody, so every time I check her nest for extras I and up with at least one gouge mark. I am beginning to wonder if I should just move her to an enclosure.