Cristina, it's definitely Tahoe and it's definitely from a piece of film that was never used. There must be hundreds of thousands of feet of film on the "cutting room floor," and I will be they could be spliced into several fantastic movies.
BTW: Notice Neri in the background. Unless I'm mistaken, the only time Neri's seen in the film at the Tahoe party is in the boathouse--never mimgling. Rocco was the chief ecurity guy at the party.