The police would not reveal the specifics of the employment sanction citing privacy.
The charges related to the actions of the then 26-year-old on the opening day of the 2020 trout fishing season on Lake Rotoiti. Roberts went fishing with a friend and had planned, but failed to obtain, a day licence.
When approached by a Fish & Game officer that afternoon, Roberts' friend produced a valid family licence, which Roberts said he was included on, claiming to be a half-brother. Roberts claimed the second name "Denise" on the licence was a typo and his name was actually Dennis.
He signed a written statement giving a false name, date of birth, address and phone number.
Twelve days later, after further inquiries, Fish & Game contacted Roberts' employer, the police, asking to speak to him. Roberts went to the local Fish & Game office the same day and when he was told what the matter was about, he exercised his right to silence and did not make a statement.
During the sentencing, Fish & Game lawyer Sefton Revell said there was a "real risk" Roberts could lose his job as a police officer due to a "massive lapse of judgment".
Judge Greg Hollister-Jones acknowledged the offending would be viewed seriously by New Zealand Police and "may well contribute to the loss of his job", but those were the ordinary consequences of a conviction.
Roberts' lawyer unsuccessfully argued for permanent name suppression and a discharge without conviction.
When approached for comment on the recent findings, a police spokeswoman said the organisation had nothing to add to the statement it made when Roberts was sentenced.
At that time police confirmed Roberts remained working for New Zealand Police, the organisation was aware of the court matter and would undertake an internal investigation.
It did not go into further detail for privacy reasons.