Looking for My Grand Mother Grand Fathers Marriage Certificate 1904 Wellington New Zealand

Hi.
All of the birth certificates of the 10 children born from the union say,
"Marriage, was at Wellington March 16th in the year 1904"

But I canot find and marriage cert in the Marriages , birth and deaths office at lower Hutt.
The names I am looking for are George Charles Davis & Amy Hanham.
(I have Amys certifiactes birth & death , they show nothing.)

The names of George charles may be an alias so we may need to look for

"George Davies"; Charles Davies; "George Davis"; "George Charles Davies" The one thing that seems to be certian is the Date "16 th of March 1904"
maybe a search for marrriages on that date?
Can that be done?

can anyone suggest another place a marriage certiface may be stored other than the registery office?

thanks Ross Davis