Our guess is stubborn rebellious chickens mad at 2 brooders who now get the best nests full-time. They have 7 other places to lay that are perfectly fine that they've layed in before. But out of 15 adult chickens (3-4 1/2 years old) we're now getting about 2 eggs a day. They harass the brooders trying to get into their nests. They've had trouble on occasion in the past eating their eggs but I always saw signs - egg mess in the nest, occasional shell, one caught running with shell in its mouth while everyone chases for a piece of the action. But none of those signs at all now . We check for eggs about 3 times a day. They're in a pen so not anywhere we can think of we haven't looked already for them to be hiding them. Anyone heard of rebellious chickens that just turned off their laying until their favorite nest is returned to the flock?