If overseas authorities do not cooperate, the Official Assignee would have to take court action and that could cost more than the assets are worth.
A spokesman for Westpac declined to comment on its chance of recovering the money.
Gao will be unable to own a car worth more than $5000, have more than $1000 in the bank, or leave New Zealand for three years.
Gao became rich after applying for a $100,000 loan to keep the doors of his struggling petrol station in Rotorua open.
Instead, the bank transferred $10 million after a clerk put the decimal point in the wrong place.
Before being sentenced to four years and seven months in prison for stealing the money he transferred overseas, Gao refused to say where the missing money was.
He said he had lost all the assets he built up over seven years, including two properties in Auckland.