Buff is a color, what is the breed? You have a shot with the silkie. My silkies will sit on anything if you leave it long enough, will finish the job, and are excellent mothers. What I will do is leave eggs for 5-7 days. If they don't sit on that clutch, I will take them away and start over. Eventually she will sit. Every single silkie I have sits on eggs. They will even steal them from each other. For your first batch of chicks, I would wait until the silkie sits. My first silkie hatched a clutch of 5 when she was 7 months oldI have several different breeds in one coop. there is a total of 5 hens and 1 rooster. two of the breeds I know for sure are buff and a silkie, the rooster is a silkie as well. they have a perch that they sleep in, the eggs ive found have been under the perch and one was actually outside of the coop although I have no clue how they managed to do that