Nelson Police are still searching for information that will help locate missing Nelson teenager Leo Lipp-Neighbours.
Next week marks the second anniversary since the 19 year-old disappeared on 24 January 2010.
Since that time Police have followed up numerous lines of inquiry and possible sightings of Leo's distinctive Toyota Corolla, but are yet to receive one positive piece of information.
Detective Senior Sergeant Wayne McCoy said his team had not given up in its search for clues into Leo's disappearance.
"Two years down the track we still haven't had any information that has enabled us to progress this case. In these situations it's very frustrating for the investigation team and extremely distressing for Leo's family. We would dearly love to get closure for his parents and we're not giving up.
Senior Sergeant McCoy said he believed someone out there knows what has happened to Leo and his car.
"My message to anyone who knows something is, do the right thing and speak up now."
Senior Sergeant McCoy said anyone with information they would like to pass on could contact Nelson Police, Ph 546 3840.
Information can also be given anonymously to Crimestoppers, Ph 0800 555 111.