How much was Barry Bonds home run ball?

Answer 1

For the Baseball to have any value as the first home run baseball hit by Barry Bonds, you would need strong provenance showing that the baseball is in fact the home run ball hit by Bonds. A letter from a player, team, or league official would be acceptable. A letter from a fan at the game would hold little weight if any.

When Barry hit his first home run, he was a rookie, and the baseball would have not been documented as such unless the ball was returned to Barry Bonds as a keepsake. Then if he decided to give the ball away as a gift or sell it, the chain of custody of the baseball would have needed to be documented.

If the baseball has no provenance, it would be valued as a used baseball. If the baseball sits in Barry's personal collection a value cannot be given as it was never sold at auction.