Very intriguing! The third and fourth pictures make it look like the animal just has dull patterning, which doesn't seem that unusual for a metamorph, especially a tigrinum metamorph. But the first and second pictures show really well-defined fine reticulation. I've never seen anything like that. There's part of North Dakota where melanostictum and diaboli overlap (and I know that a lot of the mavortium in the pet trade come from ND); perhaps this could be an intergrade?