LATEST: Police have raided homes and seized computer equipment in connection with the disappearance of Nelson teenager Leo Lipp-Neighbours.
Detective Sergeant Mark Kaveney confirmed this afternoon that investigators searched three rental properties in Blenheim on Tuesday last week.
Computer equipment, hard drives and DVDs were seized and would be forensically examined, Kaveney said.
People living at the homes would not be be interviewed until it was known whether the equipment contained any information useful to the police investigation, he said.
''We want to check emails, we want to check if anyone's been talking about Leo.''
Police received tip-offs from the public about a month ago that people living at the homes might have been involved in the disappearance of Lipp-Neighbours.
Kaveney would not elaborate further, but conceded the results of the raids were disappointing.
''I'd like to have found parts of the vehicle or sufficient information to lead to Leo's location,'' he said.
''I wouldn't think we are any closer [to finding him] at this stage.''
A Blenheim man told Fairfax Media today that eight police cars turned up at his house last week and officers had a warrant to search his house on suspicion of manslaughter or murder.
His laptop and cell phone were taken as evidence.
Police were unable to confirm this.
The man, who said he had not been charged, claimed he had never heard of Lipp-Neighbours.
Police believe Lipp-Neighbours, a 19-year-old Canterbury University engineering student, last seen in Nelson in January 2010, fell victim to foul play.
He and his car have never been found.
The inquiry changed tack in September after a case review.
New information led investigators to conclude his disappearance was not an accident.
Police believe the most likely scenario is that he was killed after finding himself in the wrong place at the wrong time.
Kaveney said police obtained search warrants for two properties on the grounds that the people living there were involved in Lipp-Neighbours' disappearance.
Residents of another property allowed police to search their home voluntarily.
Police believed the people living at the homes were not known to Lipp-Neighbours, he said.
Cannabis was found growing at one of the properties.
Police were still receiving information from the public about Lipp-Neighbours, which was ''very pleasing''.
There were still sightings of his distinctive orange car that had to be checked, he said.
''I can't go into details until we've done that.''
Ben Clark, the last to see Lipp-Neighbours, said it was good news police were still receiving leads from the public. He was unaware of the raids.
''Hopefully it turns out to be something.''
Lipp-Neighbours was last seen leaving a friend's Washington Valley flat.
He had been drinking with friends at a Nelson club earlier in the night.
Despite extensive searches, neither he nor his distinctive orange Toyota Corolla station wagon have been seen since.
Police have no suspects. A $50,000 reward offered in 2010 remains.
- The Press
The lower drink-driving limits from December are:Related story: Drink-drive limits lowered