“Current police investigations into the shots have been conducted discreetly, and most media representatives probably have the impression that the noise was caused by a firework of some description,” a 1981 memo from the intelligence service said.
“There is a worry, however, that in court the press may make the connections between the date of the offence and the Queen’s visit,” it added.
"Lewis did indeed originally intend to assassinate the Queen," the intelligence memo reads. "However [he] did not have a suitable vantage point from which to fire, nor a sufficiently high-powered rifle for the range from the target," Agence France-Presse reported.
Lewis informed officials that he was a member of a right-wing militia group known as the National Imperial Guerilla Army, although police soon concluded the organization only had three members, which included a higher-ranked figure called the Polar Bear and another called The Snowman, who reportedly issued an order to "terrorize Dunedin."
Lewis eventually ended up in jail after he was convicted of a string of offenses. He committed suicide in his cell in 1997, authorities said.
The details have prompted a fresh police investigation into the alleged "cover up."