I have a small flock of 3 different hens: an ameraucana, a buckeye, and a brahma, and they are each 30 weeks old. Now, my disclaimer is that I am a first-timer with chickens, but it seems like most 30 week old hens should be laying by now, and mine are not. They appear to be in good health - they are big and fluffy, have clean vents, have clean water, and eat organic layer mash with plenty of calcium content. They have 2 nesting boxes with golf balls in them to trigger happy egg thoughts. They also stay in their run and coop most of the time, but when I left them out to wander my small yard, I track their steps closely, and there's no way I'm missing a hidden nest. So what could I be doing wrong? I'm at the edge of my seat for eggs! Help!