The first pic of the parents is a nice clean looking boa that could easily pass as a Pastel. Knowing that your boa came from EBV originally, I would say from their "Red Group" line. The second parent is a toss up. Very clean, but not a lot of colors. Neither is a Salmon/Hypo. I would say your little guy is of Pastel bloodlines. It's a shame about his poor tail. How did the previous owner manage to do that?