I'm having that problem with my ducks. I have two, who are total buddies and lay together. Since they started laying, I normally get an egg a day from each. Only twice have I gotten one egg, and never have I gotten none. Well, this morning I got none. I looked in the nesting boxes, and also in a corner of the coop where they sometimes lay... I don't know why. No hens are ever in the boxes that early in the morning, and the ducks lay way early. I got texted my husband to ask if he gathered any duck eggs. None in the fridge. I checked the coop again. Huh. Well, an hour later I found them. Apparently they had been laid in the corner, then some of the hens scratched around in the fresh bedding and completely buried them. They were so well hidden that the bedding didn't even look messed up. Then another hen came and scratched around, and tossed both eggs out into the middle of the coop.
Wow, I really need some excitement in my life if that's today's top story. The Case of the Missing Duck Eggs.