He was in custody pending that appeal, which no date has yet been set for.
Mayer, mostly acting with alleged co-conspirator Simon Turnbull, dishonestly used documents to obtain $47 million of loans from financial company Trustees Executors Ltd (TEL), which is chaired by former Prime Minister Jim Bolger and is more than 130 years old.
Mayer made loan applications to the company with false information to buy 26 Auckland properties between 2003 and 2007.
As a result, TEL suffered "colossal" losses of at least $19m, Judge Gibson said in February.
In some instances TEL was given documents which gave the impression someone unconnected to Mayer was buying a property when he or, allegedly, Turnbull was the purchaser.
This allowed them to side-step TEL's borrowing limit.