I suppose so, but in this one I am not even really assuming the role of a "doubter".
I believe that formalized forms of boxing go back to pre-historical days. Primitive tribes today have organized forms of martial art or single combat such as wrestling. It seems very plausible and probable that boxing, in some form, did exist in 6000 BC in places like Ethiopia and maybe even before, but I haven't seen any evidence. Just the phrase "archaeological evidence" repeated again and again or just the accepted "fact" that it came from Africa. This is just not good enough. We know who discovered the Sumerien relief carvings and when. They can be seen and have been objectively dated back to around the 3rd millenium BC. However, I can't find anything displaying or even describing what this "archaelogical evidence".
As for Bruce Lee. Again, I loved reading his notes and listening to his interviews on the subject of martial arts. People like Dan Innosanto provide us with fantastic examples of what can be achieved through the freedom of cross-training. I am not disputing Lee's impact or his positive influences on the martial arts world and community. His ability, even from a solely athletic perspective, is also undeniably extraordinary. There is very good evidence to support this. However, with regards to his real fighting record all that seems to be provided is a list of matches with names of people who have never been mentioned since. Wong Jack Man's fight has witnesses with varying accounts and I think we can safely assume that certainly happened although its outcome is very dubious. Yet doesn't it seem odd that none of the named people Lee fought in a boxing tournament wouldn't have turned up at sometime to give their verdict on the great man, to tell their story. After all isn't that what everyone else has done who knew Lee even in passing? I want to find verifiable evidence of these bouts. I want them to be true. However, whenever they are ever questioned either in magazines or on the 'net you are just hit with a barrage of aggression that we have come to recognize in other "believers".