The arrangement was to help him with his immigration into the country.
Ms Ford later gave evidence against him at trial, where their marriage was described as a "sham".
The couple agreed in court that Dube stayed in Ms Ford's home only two or three nights a week, and shared a room with her teenage son.
Dube then used his stepson to send money to Nigeria and South Africa through Western Union transfers.
Some of the transactions were completed in the name on a stolen driver's licence. More than $450,000 was sent to Africa in the four months leading up to Dube's arrest.
News of the marriage of convenience comes after the Herald revealed on Saturday the existence of an investigation into Nigerian fraudsters and a review of 160 residency applications, which found more than a quarter were based on fraud.
More than 40 residency applications were declined, and eight people were charged in the operation. Three have already been convicted.
The 43 declined applications are mostly from family members of the eight charged, relatives who tried to gain permanent access to the country.
Peter Elms, head of fraud for the Department of Labour, said border controls had been tightened significantly since the Nigerians fraudulently entered the country.
Sophisticated passport scanners had been introduced at airports, as well as pre-screening processes which had decreased asylum claims from a peak of 2000 a year to 300.
Mr Elms said the introduction at the border this year of biodata technology, capturing photographs and fingerprints, gave New Zealand the "single most effective tool in countering identity fraud".
SYLVER DUBE
March 29, 2009: Arrived in Auckland from South Africa.
July 24, 2009: Marries Tihere Ford in Manukau registry office.
February 22, 2010: Arrested on methamphetamine charges. Later convicted.