Sam Woodhead will be taken to Longreach Base Hospital for a medical assessment, Queensland Police said.
The teenager's sister wrote on Facebook: "We have been told that they have found Sam!! We have no information on his condition or where he was found yet, so keep your fingers crossed."
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The Black Friday madness got started early with police called to deal with hordes of frenzied bargain-hunters across the UK.
Paul Kohler, who was set on by four Polish men, said the attack was a thuggery issue, not an immigration problem.
Cricket stars, celebrities and fans have joined a social media campaign paying tribute to Phil Hughes by leaving their cricket bats out.