These eggs came from a hatchery not a local farm?
If from a hatchery they are likely to be pure bred or from mixes that hatchery sells like Easter Eggers.
Which hatchery? What assortment was bought?
It may help narrow down the possibilities.
Super cute!
Your black one looks more like an australorp than a black sex link.
Way to early for male behaviors to show up.
I agree no brahmas in the lot.