I'm not 100% sure on the rules, but it would be overseen by the AIBA. Most likely it would be done under APB rules, which are sort of a halfway point between amateur rules and professional rules. THe APB rules come from the AIBA, they introduced them a few years back to stage special tournaments for prize money for boxers still in the amateur code. It was designed to stop top amateurs from turning pro.
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"Let your food be your medicine, and your medicine be your food" Hippocrates.