Post away with the pictures. Octopus ID (especially from photographs) is a lot of luck and a few good looks at color, markings, eyes, suckers and mantle length vs arm length.
I will note that if you purchased this in California, it is unlikely to be a vulgaris. if it came from a wholesaler (indirectly through the pet shop) then one of the animals in the Abdopus complex is likely. However, with over 300 species, these thoughts are based upon what we commonly see, not on anything you have mentioned.