When we were waiting to get Gracie's 'real' eggs for her to hatch I would just put one or two eggs a day from the other hens under her and swap them out for fresh ones the next day. Since she only sat on them one day they weren't really developed and I was then able to still use them. It kept her 'in the mood' until we got her real eggs. You could also just put actual fake eggs under her, such as ceramic ones... or ping pong balls. Just so she feels she is sitting on something. I chose to use the eggs from the other hens just to make it as real as possible, since it was going to be a while for the shipped eggs, but it seems like once they really decide they are going to be broody they don't really care what they are sitting on!i
When I give them a couple days to make sure, do I take the eggs or leave them? The cross hen was off the nest last night and laid an egg (my only EE hen laying). The buckeye was still setting with one egg under her.