Agree with Fred, there are far worse mistakes. For all practical purposes the birds you got will be pretty much the same as the red sex links.
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X2 on the Black Stars (Black Sex Links). Mine are just as good a layers as my Red Stars have been (even slightly more persistent in really cold winter weather), and they are friendlier than my Red Stars have been. And as BikerMichael pointed out, there's no way they will ever be confused with Production Reds.But, if you're in doubt, then, next time instead of ordering Red Stars order Black Stars. They're equally good layers and meat chickens.
However, they're obvious that what you're getting is what you ordered as day old chicks. The roosters will have a white spot on the head and maybe some white on the tip of the wings. The hens will be totally black with maybe white on the tips of the wings.
When they're fully grown the roosters will look like a Barred Rock and the hens will be totally black with some red feathers on their chest.