Can you try taking a pic and posting to photobucket of him? I don't know many boas thta have green in their coloration. If he was sold to you as a "common boa" or "redtail" he is probably a Colombian bci.

If he is a hypo, he will be a colombian bci morph. This site lists several morphs with pics and descriptions. The hypo they show is an adult, so is more brown, but hypos basically have a reduced pattern and less black than normals..

This is my hypo bci. He is much smaller than the one you have, so his colors will be lighter, but you can see the typical "bow tie" markings, lack of black, and orangish-red tail markings of all hypos. He isn't a very good example of the morph, but you should still be able to see the characteristics with him.