The writer claimed a girl was murdered and buried on Kaiti Hill. She was 14 or 15 years old.
Gisborne police received a similar letter but without the girl’s nationality and age.
“We are currently making inquiries to determine the veracity of the letters,” said Detective Sergeant Daniel Kirk.
“There is no information about the disappearance of a person of that age, gender and nationality anywhere in New Zealand.
“It would of course have been very helpful if the letter writer had provided some identification.”
The letters were not signed and had no return address or contact details.
“We would urge that person, if they are a subscriber to The Gisborne Herald online service, to contact us directly,” Det Sgt Kirk said.
“They can either do that through their local police in Holland or directly to New Zealand Police through any of our online platforms.”