Mr Eriepa and his brother helped Mr Moko into his home in Cannons Creek and placed him on a couch.
On Monday, Mr Eriepa became concerned when his workmate failed to turn up to work or call in sick.
After finishing his shift early on Tuesday morning, he drove to the property and discovered Mr Moko lying dead in the same position he had left him two nights earlier.
Norman Mangu, who was also with Mr Moko on the evening of the party, told the coroner he saw him drink a couple of beers, 10 Woodstock bourbon and cokes and about 20 shots of peach schnapps, sambuca and straight bourbon.
A post mortem examination found Mr Moko's blood alcohol level was 354 milligrams of alcohol per 100 millilitres of blood. The legal blood alcohol limit for a driver is 80 milligrams of alcohol per 100 millilitres of blood.
Forensic pathologist John Rutherford said Mr Moko was also morbidly obese, and people in that condition often had significant breathing problems, especially during sleep.
"In my view, this is likely to have contributed to the respiratory depression induced by alcohol."
Coroner Devonport found that Mr Moko died of acute alcohol toxicity.