you have to ask the one that sold you the Gecko or you have to know the genetic Background or you´ll have to prove him/her with breeding to a Tremper or Las Vegas Albino.
When you got the BB from a petstore it will most likely be Tremper as LV is not that comon.
You can try posting eye pics of the BB, some can tell which albino morph it is from the eyes. Or you can contact Mark Bell and ask which albino line he is using in his BB project.