Okie dokie. I have agoutis with 'black' tails, (well, they're brown tails, but still). But as of now, I have never seen any ASFs with any black fur at all, only agouti, and variations of agouti. So it would be really great to see black ones.
I'd love to take a look at 'em.
Basically, unless someone catches one in the wild, it's gonna have to be a spontaneous mutation out of someone's stock.