A Centennial 1876 Revolver With A Tall Tale

Pat Garrett
Okay everyone loves a good story right? Well here's the one I was told on this pistol.
   I purchased it from a gentleman in Louisiana near the town of Homer. Homer is where Pat Garrett's Family lived and the location of their family farm. For those who don't remember, Pat Garrett was a legendary lawman of the Wild West famous for shooting Billy The Kid.
   The story is Pat Garrett gave that this little Freeman W Hood, 1876 Centennial revolver to his little brother Alfred Jarvis Garrett along with another little pinfire pistol for his 21st birthday. Alfred left it to his son who later sold it to the grandfather of the person I bought it from. After that it was passed down as a family heirloom along with the story.
Centennial 1876 Revolver
  The person I purchased it from seemed to genuinely believe the story. The only problem is how can I possibly ever really verify that all this is true? It's not like a Smith and Wesson where you can write the factory for a record of who purchased it and where. Any suggestions would be greatly appreciated! Also see the video here.