Yep, I agree. One thing about "common boas", they can certainly have BCC mixed in somewhere, or have mainland and island in the mix.
Without locality data from the breeder, its impossible to know for sure what is in your boa. It's not a big deal unless you were promised something, or sold a BCI at BCC prices.
It's a nice snake and some of the fun of these "not sure what" boas is you never know what size they'll end up at.
I have a "mutt" carpet python and a true locality BCI. I know pretty much what the boa will end up like, but the carpet has coastal in it and she could be 7, 8, 9 or 10+ feet. It's sort of fun not knowing.
I over posted a bit here. But you have a nice looking snake, and most likely it's what Daybreaker figured it is.