True Patriot
Sanity is subjective
You may want to do a search of the area they range in. I'd bet you find hidden nestsGoing to follow along, I'm in a similar situation, I have 2 - 2 yr old EEs that should be laying, but I can't find any of their eggs. They free range, so treats are plenty, as well as are hiding spots for eggs.
Usually I can find them if I look hard and long enough, but I've searched high and low with no luck...
I have an Australorp that's laying, a rooster, and 2 5-mo old chicks with my two EEs.