The above picture was taken in 1886. It is the property of the Arizona Historical Society. Geronimo was captured in 1886. So it is undoubtedly a completely staged photograph.
Ahhh - "white" folks took these photographs - you have to remember that while this gun leather MAY have belonged to him - it was not uncommon for the photographer to use "props" in his photographs - it was commonly done.
Yes, and this practice was ongoing from at least the days of the Civil War if not before. Soldiers had studio shot made often with weapons they would never have owned or carried, but are depicted with in photographs.