Good to see that the Mods have cleaned up several posts.
I used to work for a race team, Phase One Endurance and we used to sell off the Championship winning bikes. I know for a fact that three versions of the 2003 World Championship Winning Bike were sold and yet the "original" one is still at the teams HQ

. In one season, a team uses many frames, engines etc so there is never just one single original bike. Frame numbers can be made up on race bikes, I've seen it done. When we bought World Superbike frames from Yamaha they came with no frame numbers at all. The scrutineers insisted they must have frame numbers so we got out the punches and numbered the frames YZF000001, YZF000002 & YZF000003. They have probably all been sold on by the team.
At the TT a few years back a very elderly Swiss collector came to our tent immediately after Steve Plater had just won the SuperStock on our R1. He said he wanted it for his collection of race winning bikes. He was told to come back the following morning with the cash (and lots of it

). By the time he returned the bike was nothing like the one that had won the race as several bits had been changed. I managed a few of the spares for my own R1 including the race fairing signed by Steve. The engine in my R1 was used by the team in a 24 hour race during 2007 so I could claim that it was partly a race winning bike.
I would suggest that all the "original race winning" vehicles that are in collections and museums are all a little bit fake unless you managed to grab the vehicle as it crossed the finishing line and put it straight in your garage. Also the more time has passed and the more owners it has been through, then the harder it is to prove originality.
Perhaps with modern DNA testing, it could have been established if it really was Gaston's blood, sweat and tears soaked into the bike?