What kind of rainbow boa is this?

[skyler731]

Hi, I recently bought a rainbow boa that was sold as an Argentine but after thinking for a little I started wondering if maybe he's actually a Columbian instead (something I really don't want to have). Here's some pictures of him (he's a bit dull because he was about 2 weeks from shedding, but after he shed he doesn't have too much of a coloration difference). What do you guys think?