The rumor is that it is Stokkebeye Luxury Navy Flake. I don't know that for a fact however, so maybe someone can do a side-by-side comparison.
I've never had the IRC Slices, but I like the IRC Virginia Flake quite a bit.
I have a 7oz. PermaMoist bag of the straight Va. laying around somewhere. It must have about 10yrs. of aging on it.
I should probably break it out and see how it is.