Well, of course early field photogs like Matthew Brady and Roger Fenton were mostly found amidst the Yankees, so you'll more likely find individual studio portrature of the soldiers of the Confederacy, popular to go with carnets du viste, rather than unit still photos.
How about a single photograph of a black confederate unit in uniform holding rifles?
Well until I run across one [I can think of a couple of fellers to ask, here's a Daguerrotype of one of their officers with his, uh, pistol.
Thanks.
Don't mention it.
Tick, tick, tick...