Hi Richard Hoyer,
I hope you did not get the impression that I was trying to provide false information about ruber boas. I was merely just relaying what I kind of understood about the Southern Rubber boa, based off of what is at my grasps, be it CAFG website, californiaherps.com, etc. In no way am I an expert or trying to be an expert, but merely just giving my 2cents.

I am very interested in finding Charina bottae in SF, my hometown. I am actually going to lay some boards in the Presidio to try my luck. You mentioned the potential of boas being found in the Southern patys of SF...this is very intriguiging...