Oh boy.. so after I already was 100% sure they were roosters they might be hens after all provided they are Australorps. I'll have to get a better picture of them.
Thanks for your detailed explanation
They could be hens no matter which of the those three breeds they are. I would recommend posting full body profiles of them showing heads, legs, and tails on our What Breed or Gender is This? section at https://www.backyardchickens.com/f/15/what-breed-or-gender-is-this. Not only will it make them much easier to sex, but perhaps one of our experts there knows some small visual difference between Black Australorps and Black Orpingtons there that I (and not even John Henderson) are aware of. I hope for your sake that they are hens. Good luck.
