Hello, I've got a silly-sounding question, so please humor me... Lately, when I've checked our nest boxes, I've occasionally found eggs and bedding with yolk splashed all over them. -There are no shells to be seen anywhere. -This happens during the day. There has never been a mess in the box first thing in the morning. -I'm out in our barn a lot, but I never seem to catch a chicken in the act of breaking or eating an egg. Could I have a hen dropping shell-less eggs for some reason? I give all our birds oystershell free-choice. I dunno... Help a newbie out?