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First...I am NO expert...not even a toddler. Lets see what the others say, but I think hens. Your blue looks just like my LouLou and she lays me a pretty blue egg very day. My girls were hatched April 8th. I think ours are the same age. Are you sure they aren't hiding them somewhere in the yard? Could someone be eating them? Hope the others will offer their suggestions.
Their poop still looks like worms and someone said the poop will get fatter when they start laying bec their vent will get bigger. I've been watching their poop. But it could be possible about maybe they are laying and I haven't found the eggs. I do check all around just about daily. The molting is over so I am getting eggs from everyone else.