Yeah, that's the period this flag was used, so yeah Henry Slocum. Like you mentioned & shared with me off forum, some old New England roots for sure! I don't know why I assumed his roots were not as old, but pretty cool they are!
Getting someone to authenticate things is without a doubt key, especially when there isn't a lot of info to go with the item. The Horse Soldier (and some other places in Gettysburg) often have good accompanying documentation for things they're selling. Other places not so much, so that's always a concern. I'd imagine the black light test is still employed, even if as part of the basic testing and if needed deeper analysis with scans, high res images and other computer based applications would be used.
The second paragraph on the writeup does state: "It is conceded by experts that this flag was a product of the Philadelphia Schuylkill Arsenal under contract to the US Quartermaster Department. Flag expert Greg Biggs is aware of this flag which passed through the hands of American military expert Craig Nanos. Where 12th Corps headquarters personnel went in battle there went this guidon! Important and museum worthy." So there's at least that and I assume those name drops are key people.
I'm sure they'd love to have the flag up the road at the NPS Museum, but probably not authorized to spend that type of money.
_________________ General Scott Ludwig4/II/ANV 
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