"Interpol has been notified and police continue to liaise with our partner agencies both in New Zealand and offshore," Detective Senior Sergeant Bridget Doell said.
Late last week, police said their investigations into his whereabouts had led them to believe he had fled New Zealand.
Customs confirmed Nolan left the country having "deliberately circumvented border controls by using a valid passport that was not his own".
In a blunder that was described as "a case of human error", Nolan was waved on by a Customs official after the eGate passport check - which uses biometric data to match and confirm a person's identity - flagged him as a potential risk.
"The eGate identified further checks were needed on the passport," Customs said in a statement.
"The image was automatically sent to a Customs officer, who incorrectly identified Nolan as the passport owner."
An overhaul of systems was recommended by a Government inquiry following the escape of convicted murderer and sex offender Phillip John Smith to Brazil in November 2014 to prevent prisoners and wanted persons from leaving the country.
Smith, who was jailed for life in 1996 for murder, sexual assault and kidnap, was on temporary release from Spring Hill Prison when he fled the country using a passport he obtained under his birth name.
The subsequent inquiry found deficiencies in how multiple Government agencies shared information.
In particular, it said police should provide Customs with better information on who should not be allowed to leave the country, and that a system was being developed that would create an official identity for everyone charged with an offence.
