In a natural environment, the hens will lay in one box. When the number reaches 9 to 15 eggs, one of them will begin setting on the eggs. Does your Black Orp sleep in the nest box too?
I have a Hatchery RIR that growls at me when she is on the nest. It is cute but she has not gone broody. The two broodies started sleeping in the nest box, got a "look" to them and would not move when the other hens laid their eggs. The egg laying hen kind of skooched in, laid the egg and then the Broody moved it in with the fake eggs she was trying to hatch.
Put a bunch of fake eggs into the nest box. If she goes broody, wait until night time and switch the fake ones for fertile ones. To make sure she is broody, wait some time, like 5 days.
Good luck!
Thanks Ron, I was wondering if that would work.. I guess when my two new Silkies get out of quarantine and I get a silky rooster I will try that.... Silkibators!

