It's also funny how chickens go broody almost all at once. I have found my hens laying in strange places too. Like on the coop floor when there is a nest box there.The new first time Mama. She has one more egg under her, but I don't think it is going to hatch. Broody Hen #2 hatched out 2 babies, but I can't get pics yet.
I had a third hen go broody, and I only have two nest boxes. I had to lock her and the other girls out because it was near hatch day. So broody number three found her own private nesting spot.