The BC forms have always been pre-printed with 151, based on the appearance of BC’s from way back. The year/volume# and serial number are assigned at the state registrar’s office.
The BC’s were all complete before they were microfilmed, so they had the number on it when they were microfilmed.
When the system switched to computerized records the information from the BC’s were entered into the database.
If you have evidence regarding the HDOH trading out the identity of a dead child to a foreign-born child for purposes of identity fraud, that would be an important thing to document. Particularly if it sheds light on the system and how this could be done. Was this done recently?
No doubt it still goes on in Hawaii ~ but the case I know of is a bit remote, but typical of the method.