"Perhaps you could direct my attention to a SOURCE REFERENCE on this subject"

I thought I did. Again...

Source: History Channel Documentary 80 Acres of Hell

See also:

To Die in Chicago: Confederate Prisoners at Camp Douglas 1862-65 by George Levy

Portals to Hell; Military Prisons of the Civil War by Lonnie R. Speer

So Far from Dixie: Confederates in Yankee Prisons by Philip Burnham

You are trying to make the case of no "signifigant" number of black Confederates being captured or killed as being proof that no black Confederates existed. I don't know what you mean by "signifigant" but I suggest reading...

Black Confederates by Charles Barrow (Author), J. H. Segars (Editor), R. B. Rosenburg (Editor)

Black Southerners in Gray: Essays on Afro-Americans in Confederate Armies by Athur W. Bergeron Jr.

What a shame that folks dishonor these men in order to perpetuate their own ideas of how things happened. Don't you agree?