Hi,
The boa you bought seems to have a lot of color for a young BCI, maybe thats why he cost a bit more, his parents could have been pastel.
Try to start him on fresh thawed rat pups they are excellent protein source and have more meat than mice.
Good luck
doug
psps here's a source of a complete and free care sheets that you can download to your pc.
written by an excelent Boa breeder here in the states.
http://www.redtailboas.com/carelinks/index.html