Yeah,....I've seen many animals that look identicle to that one, but all of them where wild-caught. That is a very common phenotype seen in the wild. I suppose it could be from a w/c x captive anery breeding, but that look is commonly seen in corns from the wild.
Although it is somewhat darker than most, the term "melanistic" would not apply here.
Like Mike H. stated,....I might tend to question the snake's lineage also,.....but it's not impossible the snake was captive born.
~Doug
-----
"Better to be silent and thought a fool, than to open mouth and remove any doubt!"