First names were sometimes disposable items for these guys. They could use one for professional purposes -- have the chips delivered to a fictitious J. or James Barnett -- but the legal name was Joseph and that (from a driver's license) shows up on the arrest record.

I hope you agree that there being a Joe Barnett who was involved in gambling in Cal City, lived at the Jerome Hotel and actually helped run the Owl Club is conclusive evidence, given the Taylor sales records information, that these chips are from the Owl Club.