Do you have a current CA pink slip with numbers that match the ones on the truck? If so, having dealt with the California DMV for many years, I'd suggest NOT kicking that hornet's nest! There's absolutely nothing in the world worse than a public servant with an attitude case, particularly in Commiefornia!
"Don't Ask- - - -Don't Tell" applies here. If somebody before you managed to satisfy the state that things were legitimate to the point that they issued a clear title, be thankful it happened, and don't go making any waves that might drown you!
Jerry