I am not seeing the saddle feathers at this time but I do think you got the short end of the stick so to speak.
Ideal hatchery has Black Australorp on sale this week for a tomorrow ship date. I always had trouble finding them when I wanted or had room so I toss that out there in case you are interested in hatchery sexed birds. (Just don't go and order straight run.)
If they are indeed 3 cockerels, once they grow up I will have 6 roosters (currently have 1 rooster, 5 cockerels), and 24 hens. If the majority of them grow up together will they be able to coexist? What's the lowest ratio one can get away with?