The McMurray site has photos and some utube clips of the baby chicks. Go look through them to guess what they sent you. I think the rust red chicks look like red leghorns. The top two look like ee/"Americana"-type chicks. The black ones with the yellowish white spots look like black Australorps. The ee's are mixed, so you may never know the exact breeds. Just take care of them and enjoy watching them grow.
We got 26 "ornamental layers" from McMurray back in June and I had guessed right on most of them by looking at the utube clips. We can't wait for our girls to lay eggs to see what color eggs the unidentified mixed chicks lay. Good luck. Hopefully someone with more experience will be able to be more helpful.