Mitchell Bowran and Charlie Star, both now 22 years old, were accused of raping the girl behind a shed on the night of September 2, 2017.

A jury on Tuesday decided Star was guilty of one count of rape, not guilty of a second count and they were undecided on the third.

Bowran was found not guilty on four counts of rape and the jury was undecided on the fifth.

The mixed verdicts come after the jury of six men and six women deliberated for more than two days, starting on Friday afternoon last week, following a trial which ran for more than a week.

It was agreed between the prosecution and defence that the victim and Bowran were flirting and kissing before they walked behind the shed and were joined by Star.

All three had been drinking alcohol.

Crown prosecutor Peter Triandos told the jury in his closing address that "we're talking about sexual penetration, we're not talking about kissing".

The girl gave evidence that she told the boys "I don't want to do this anymore", but they continued.

Both Star and Bowran denied the rape, saying the sex was consensual.

The jury concluded Star forced himself on the girl on just one of the occasions she was penetrated.

Their "undecided" verdict on two other occasions of penetration - one allegedly committed by Star and one by Bowran - means another trial with a new jury would be needed to reach a conclusion.

Prosecutors are still weighing up whether to ask for a retrial on the undecided charges.

The prosecution of Star and Bowran has gone though a complicated history, with the first trial held in Wodonga having to be thrown out due to legal reasons after the jury had already heard five days of evidence.

The second jury at Melbourne County Court was shown recordings of evidence given in the first trial, so the victim and other witnesses would not be forced to repeat their accounts of what occurred.

The remaining witnesses, including those giving character evidence for Star and Bowran, were questioned in the courtroom.

Barristers Charles Morgan and Hayden Rattray argued that the victim fabricated the rape because she regretted the sexual encounter.

Star's barrister Mr Morgan told the jury in his closing address that her story "doesn't pass the pub test".

He said the "raw and experimental" sex painted Star in a bad light, but claimed it was just immoral, not illegal.

Bowran's barrister Mr Rattray said there was too much doubt to find his client guilty.

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He said one person gave evidence the 17-year-old girl was heard laughing behind the shed, but no one heard the crying or screaming she said occurred.

The girl told a friend at the party she was raped and reported the allegation to police that night, before going through a medical examination the next day.

Photographs taken that night showed bruises and scratches on her legs and stomach.

But a medical expert said they could have been caused either by rape or rough sex.

Star and Bowran were supported by family, who were sitting in court throughout the trial.

No further court dates have been set at this stage as prosecutors consider their options.