Black sex link?

[Fallen Leaf Farm]

I was told this was a black sex link. She (and others) should be about 11-12 days old. Any guesses?

With her "sister" who is a little bigger and has longer wing feathers and tail feathers (1st doesn't really have any)

And her other "black link" "sister" (with all of the BO girls) and the 1st's little rear end

 

[paddock36]

The look about the same as some chicks that I just hatched out on the 5th, with maybe a little more wing feathers.

 

[Baymule]

I got 3 that look like that and they were labeled black sex link.

 

[Year of the Rooster]

The chick in the first picture looks more like a Black Australorp. You will know for sure once they feather out. The Australorp will be completely black, and the Sex links will have reddish orange feathers around the head/neck area.