I don't know , other than to say that he died 103 years ago in 1911 at the age of 31. He is the only member of the Hall of Fame who's career lasted less than 10 years.
He was not inducted into the Baseball Hall of Fame until 1978 , so practically speaking his autograph would have had little monetary value for the 67 years prior to his induction less incentive for someone to save one if they had one. During that time there were two World Wars and a Depression, many private companies went out of business and their records were destroyed.
While its entirely possible other Addie Joss autographs are or were out there , even in institutions Most buildings of the day especially in the mid west were wood frame and coal heated. It was not uncommon for them to just burn to the ground.
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