Ah, combined bins! I do believe you have two cuckoo Marans pullets. The hatchery ones don't have leg feathers.View attachment 1058365
I also had purchased chicks at a store. They were in an orphington bin. I was adding some new breeds. So I got 2 buffs and 2 blacks. Well after a week I thought they may be barred rocks. But now I'm not so sure. The legs aren't yellow and the markings aren't barred. Any ideas?