"What Okubo is saying here is that they used to have a date accepted and a date filed on their COLBs."
Why then can no such a COLB can be found? Have you ever seen one? Can you show us one of these old scholl COLBs that used to have both these dates? or a long form?
Here is what Hawaiian short forms looked like before they computerized them.
No sign of either.
But while you're at it, take a look at the "race" of the father. Hmmmm... "American." What does that remind you of?