Hmm I took a look .. interesting... they say exactly the same thing! Not a "true" Black but a "seriously" dark reverse brindle. So dark in fact that I think you'd have to actually see one of the dogs in sunlight or compare them to a true "black" dog to see the difference. I can't tell online that they are not "black??"
AKC Black Boxer Champion Boxer Puppy For Sale In Texas Boxer Breeder Black Boxer Puppy
Gunther Mastiff/Pit Mix 2000-2010
Heidi Brindel Boxer 2000-2000
Struddell White Boxer 2003-2013
Stewie Boxer/Pit Mix 2000-2001
Rocky BLK Over Size Wl GSD 2007-2017