I have a serious egg eater problem right now. I tried the mustard in the egg thing but they love to eat that. It sometimes doesn't last an hour. I've got golf balls in there but it's still not working too well. Unfortunately, there appears to be more than one. When a hen lays in the nest, at least two and sometimes three other hens are waiting nearby to get the eggs. I've gone out and collected the eggs and returned in less than a half hour to find one or two broken new ones. I suppose it's possible that they're eating their own eggs. What's worked a little better is raising the lip of the nesting box by three inches or so (it was about two already) and then increasing the straw that's in there. Today, I got 8 eggs with none broken but a lot were under the straw. I think the culprits were jumping into the nesting box and scratching the straw out since each box would be completely cleaned of straw but left with egg white, yolks and shells. WIth a higher lip, it took more work to see the eggs and the scratching disturbed, but did not displace, the straw. The extra straw might have helped keep the eggs from cracking as well. It's too early to know for sure. I'm going to look into those trays but 8 eggs today and 6 yesterday is a lot more than we had been getting which was 1 or 2 and a gooey mess to clean up.