The jury in the High Court in Auckland found Cooper, 25, not guilty of the 2009 murder of Javed Mills but guilty of the lesser charge case covers.
Mr Mills' headless skeleton was found in the Auckland suburb of Mt Wellington in 2011 but not fully identified until June 2012.
Cooper had earlier admitted a charge of perverting the course of justice after burying Mr Mills' body, setting up a Bebo profile in his name and destroying his skull.
Police inquiry head Detective Inspector Kevin Hooper says family members had made some inquiries about Mr Mills' disappearance, but went no further after discovering the Bebo profile set up by Cooper.
"If that's one thing that I can say, if people haven't seen loved ones, report them missing, because Javed wasn't reported missing, and now we know why."
Family members were upset and avoided reporters as they left the court on Thursday, but Det Insp Hooper said they appreciated the decision was up to the jury.
He said it was a harrowing trial for the family as police had to keep some details from them prior to the trial because they were set to be witnesses.
Prosecutors said Cooper struck Mr Mills in anger because he was upset over money Mr Mills owed him, and then buried his body outside his home in Mt Wellington.
They said he later smashed Mr Mills' skull because it could show he murdered him smart cloud HK.
Defence lawyer Mina Wharepouri argued Cooper killed Mr Mills in self-defence, and he tried to cover it up because he thought it would be misconstrued.
"He simply acted at that point in time with panic," Mr Wharepouri said outside court.
"At the end of the day Mr Cooper feels very sorry for his actions and he understands that his attempt to conceal the fact of Mr Mills' death has had a devastating effect on Mr Mills' family where to buy wigs.
Cooper will be sentenced on October 18.
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