"Because the old [recently demolished police] building was so close to the historic Monmouth Redoubt, it was important that any earthworks went through the archaeological authority process.
"Under the Historic Places Act an archaeological site is defined as any place where human activity took place before 1900. That's certainly the case with the police station/redoubt area," Mr O'Hare said.
Archaeologist Ken Phillips said some pre-European evidence had been recovered from the site, but nothing from the site's military history.
"To date, archaeological evidence of Taumatakahawai Pa has been identified, recorded and excavated. These remains are considered significant and represent the only intact evidence of this little-known pa in central Tauranga.
"[But] no archaeological evidence of 1860s military occupation of the area or pre-1900 armed constabulary or police activity has been found," he said.
Ngai Tamarawaho kaumatua Peri Kohu said: "Our role has been to support this investigation and I can confirm that apart from some post holes and evidence of prior occupation ... the preliminary investigation has not resulted in any significant items being found."