I don't, but I have an Axanthic from a lesser known line (RMJ Line) that seems, at least from what I can tell from pictures, to be very dark, and seems to get darker as he grows. I also have two hets of the same line, so it will be interesting to see what I get. Part of the problem from being from a lesser known line is its harder to get a consensus of exactly what he is, but you be the judge...
...Here he is
BrandonsBalls