The man pictured in CCTV footage released on Saturday is not missing man Christopher James Bates.
Police released the footage believing it may have been of Mr Bates, but following feedback from the public it has been established it is not him.
More than 40 search and rescue volunteers are set to look for Mr Bates on Saturday in areas around Alexandra in Central Otago.
The 22-year-old was last seen on the afternoon of February 11 at Alexandra's Z service station on Tarbert Street, police say.
But the newly released footage was taken a day later on February 12 at the town's I site Visitor Centre and police believe it shows Mr Bates.
"The footage does not show the man's face, making identification difficult," Detective Sergeant Derek Shaw said.
"By releasing this image we hope someone in the community can identify him or provide more information that may be helpful to our investigation."
Mr Bates is described as being of slim build, about 180cm tall, with short to medium length brown hair and brown eyes.
He was last seen wearing a grey hoodie, white T-shirt, dark shorts and sneaker style shoes.
Police say he has not accessed his bank accounts or used his cellphone since he was last seen.
Saturday's search effort will concentrate on areas that previously proved difficult to access because of thick vegetation and some flooding, Det Sgt Shaw said.