To file for a divorce the parties have to be identified, to obtain custody, a child needs to be identified.
The FOI request resulted in seven pages, numbered one to 12.
People who have filed FOIA requests with federal or state governments often find that the request is only partially satisfied. Bureaucrats tend to be "anal-retentive" and devise many reasons for not allowing inspection of parts of records, not necessarily in compliance with the applicable law. I would tend to doubt that the state bureaucrats who responded to the request re the Hawaii divorce case allowed the complete file to be disclosed. So there is a reasonable possibility that some baby O birth document is still in the file, under lock and key for 45 years.
Good deduction !