Hey T,
More then likely your Boa is a Normal, Imported (farm raised) Colombian Boa Constrictor. Petco (all that is evil in pet stores), does not normally deal with specific Boa morphs or localities, in fact they do not normally deal well with reptiles at all. But they do normally have imported Boas that they sell and some of them are down right pretty too!
As long as the snake was not in their care for too terribly long and you take it to the VET for a check of parasites, it should well.
Feel free to browse my Web page for care, heat, lighting, feeding and caging information on your new pet. I would also recommend that you obtain the book, The Boa Constrictor manual or another short care book. They are about $8-10 in most pet stores.
As far as handling the snake to keep it tame, well that is more a disposition of the animal then it is a handling issue. Most Colombian Boas are docile, but certain times they will be a bit more jumpy. Feeding time with food in the room, shedding time, breeding season are all possible times to get a bite.
I hope this helps some
As far as naming your Boa goes, I would try "Lucky" as the name, because your Boa is lucky to have gotten out from Petco and into your home when he did!
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Jim Hopkins "Hoppy"
Hopkins Holesale Herps
Hopfam1@aol.com