Murren and Lee said they and others discussed forming a partnership with Schaeffer that would own a vineyard and winery.
After a 2008 approach from Schaeffer, Murren said he and his trust had personally paid Schaeffer US$1.6 million (NZ$2.3m) and Lee said he paid US$700,406. The pair allege false representations were made to them that they would be part owners of the vineyard
In a just-released judgment, Justice David Collins ruled Schaeffer made negligent misstatements to Murren and Lee and is liable for them.
"I have also concluded that Mr Schaeffer is liable in relation to causes of action brought under the Fair Trading Act 1986 and the Nevada Deceptive Trade Practices Act," the judge said.
"None of the affirmative defences alleged by Mr Schaeffer have merit. Accordingly, I find Mr Schaeffer is liable for the damages sought plus interest. Judgment is entered in favour of Mr Murren for US$1,600,813.92 plus interest and USD 700,406.96 plus interest for Mr Lee," Justice Collins said.
Mahana is on the market for sale and was tipped into receivership in September.
In their first report last week, receivers said the business owed about $20 million to a related company that developed the vineyard and winery. Rabobank was also owed $3.2m, the receivers from KordaMentha said.
Trade creditors are owed a further $223,000 and employees are claiming $41,696.
The receivers are selling Mahana's 21ha vineyard planted in pinot noir, pinot gris, riesling and chardonnay; a 1589sq m winery, a cellar door tasting room and retail outlet designed as an a-la-carte restaurant and a commercial grade event venue.