It may have been lost during church renovations over the years or someone may have taken it for safekeeping and it had been stored and forgotten.
For the past three years Lynley Fowler, one of the church's elders, has been plugging away at researching and recreating the list of members of the congregation who served overseas in World War II.
"The only thing I had to go on was our membership roll," Fowler said.
She searched for surnames in World War II records via Ancestry Library at the Alexander Heritage & Research Library.
"Then I realised I was only getting names for the Army, not the Navy or Air Force," Fowler said.
She sent a list of possible surnames to a New Zealand Defence Force archivist who turned up some more results for the roll of honour.
"We're very aware that we haven't got them all," Fowler said.
"We finally had to go with the list we have got."
A $2500 grant from Veterans Affairs paid for the lettering of the names on the board. The board itself, a copy of the World War I honours board in the church, was made by Bruce Beadle, who is a member of the church's board of managers.
Van Os thanked Fowler for the extensive work she had done and acknowledged the contribution those on the honours boards made during the wars.
"It is right and proper that, in the week of Anzac Day, we dedicate this roll of honour in their memory," he said.