i have an issue where my hens won't leave any bedding in the nest boxes they are currently using. my 14 hens generally pick two boxes they will use, changing things up every few weeks. the boxes themselves are plywood, and i have used straw, shredded paper, and (most often) wood shavings as bedding in them. they sometimes are apparently breaking eggs in the boxes, and i have determined that this only seems to happen when i haven't replentished the bedding in more than a day. anyone else have this problem? anyone have any solutions to it? thanks.