Amateur boxers have passbooks books that each fight is recorded in. Fights in national tournaments are better documented, but club fight arent kept track of aside from the passbook. I lost my USA pasbook a couple years ago after about 15 fights and the form that i had to fill out to get a new book asked to list my record. I could easily have put 15-0 and it would have went, course I put my real record. My point is theres eally no way of knowing for sure.