My grandmother (deceased 1931) married in 1919 in Victoria, Australia. My mother tells how her mother forgot to register her marriage and when she remembered about it, it was decided they would not do so, as they were scared of any fines.
I have the original marriage certificate from the clergy who performed the ceremony, which gives the priest name, role and religion, location, both names, date, signature of parties, priest and 2 witnesses.
I have searched Victoria's Marriage records and have found no possible record.
What additional information should I seek to class this as proven?