There's a lot, a LOT of people who claim aboriginal heritage, and it's hard to pick who. The level of mixture you need must be very low. BTW there's multiple gov benefits etc that you can claim . . . hmmm.
I worked with an 'aboriginal' guy, he was of some minor mixture. But he was aboriginal . . . complete with blond hair and blue eyes I kid you not.
Then one year he was in the running for an award as a young aboriginal success story, having gotten a good job with a big name company and was an apprentice steel worker. Interesting though, as part of his application process, he was to submit a current photograph, "the applicant at work doing their thing". Oh, the coin dropped ( for me anyway ) I was actually the one chosen to take the photos and help him chose which was best to send in. I wanted to suggest I do a little photoshop work to help hide his more nordic features. I choose not to say that and let it go through.
And to let you know, he didn't win the award, funny that.