However, the judge chose McKay as the winner of the fight.
Larby had the bittersweet consolation of being given the “runner-up of the tournament” award.
Patu Tahi head coach Kim-Maree Larby said the decision was confusing, as Jett had won two of the three rounds.
“I don't want to take away from the fact that he (McKay) fought a good fight. . . but no kid should win one round and take home the entire fight.”
Patu Tahi is a small gym and its boxers don't have as much opportunity to get in the ring as those at clubs in major centres, which makes it hard for them to get experience fighting, she says.
“Our kids have the ability to be at the top. As a coach, I'm incredibly proud of what our kids did.
“We're still a little club, and to even get a medal is special.”
Each of the three Patu Tahi club fighters to travel for the tournament won a medal.
Tyla Kahukiwa-Larby won gold unopposed after her opponent suffered a motorbike injury and required surgery the week before their fight. Jett Larby won silver and Khadyn Kahukiwa-Kora won bronze.