I just checked, I do that once a day. Yesterday I put 3 of her eggs under another hen that decided to be broody,( she hatched some out last year), because the 1st broody had 10 eggs. So the white egg, a Leghorn/ Mottled Java cross was there. Now there is one green egg pipped under her, 2 more green ones to go and 3 Mottled Java brown eggs. But the white egg disappeared! No sign of it, I even pulled the hen out to look under her wings and feathers. That coop and run have chicken wire, hardware cloth over it, a covered top, then deer net over that. It's buried 18 inches in the ground, I have old garden blocks around that. So nothing got in there. It's wet and raining so I would find digging as I looked, nothing. The other hens are clean, she's boss hen anyway. I just cannot figure out where it went? my husband and I looked and searched all over, no sign of it. No shell bits, nothing! I am so upset and hate mysteries.