Whanganui Regional Museum collection manager Trish Nugent-Lyne said, since 1975, anyone who found a Maori artefact must, by law, register it with the Ministry of Culture and Heritage. The registration is done through the local museum, in this case the Whanganui Regional Museum.
When the artefact is registered, the ministry lets local Maori know about the find, so that they can make a case to claim it. An artefact found near the Patea River mouth has recently been registered, and given to the Aotea Utanganui Museum of South Taranaki.
Some tribes have been successful in claiming and keeping artefacts.
Mr Kersey didn't know there were any laws about such finds, and said he had found another adze in the Waitotara Valley years earlier. It was much bigger than the latest one, and he gave it to a person he was working for at the time.
"It was probably the wrong thing to do, from what I have been told."