Hmm, I did a search on GenealogyBank. I found a lot of articles about Fred Hans after 1900, but not quite as many prior to 1900.
I did find these:
6/11/1899 Omaha News - His account of the Hole in the Wall Country
8/16/1894 Omaha News - Tracing His Lost Brother, about tracking down a brother he claims was kidnapped as an infant
7/29/1882 Owyhee Avalanche - article mentioning that Shacknasty Jim died the previous summer of consumption
I'll email them to you.