Judging from the peaks on the saddles (more bcc than bci) and the color of the tail (more bci than bcc), I'd venture that you do have a bci/bcc cross. As for the locale of the bcc... well... anyone's guess is as good as mine. A pure BCC has the potential to be identifiable from it's looks, but not always. When you get into the crosses it gets too tricky to tell exactly.
However, I think it's safe to say you got yorself a good-lookin cross. If the guy you got it from says it's a guyana/columbian cross, I'd take his word for it.