I've only been working with leopards a short while, but have been a fan of them for some time. I have seen these pattern anomalies not only in boas, but in ball pythons as well. A normal ball het for pied for example, to me don't show too much expression of an underlying recessive gene, however, these pics of some balls I'm linking to below, clearly show pattern that is definitely not normal for that appearance.
Both are co-dom and dom balls, a spider and a pastel, both are het for piebald. Any one who knows what a spider normally looks like or a pastel, will see instantly the difference.
I suppose the underlying recessive gene can influence the appearance of the snake it is in, but not always. I think time will tell if there are clearly markers for such things.
The het leopards I seen with awesome markings, were pure Sonoran, and not a locale mix, that could play a part as well.
Its all neat stuff to watch and figure out, at least try to.

Here are the links to the pics of the pastel het pied and the spider het pied.

Cheers!!
Mike
http://www.grazianireptiles.com/gallery_images/1140464229.jpg
http://www.grazianireptiles.com/gallery_images/1140464366.jpg
more pics

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