It sounds like an intriguing plot. I would assume the Passport itself got awakened along the way, and that it's a "natural" fetish rather then an item someone by design put spirits into it?

Or is the idea that a New Yorker Garou got his hands on the item and used it's metaphysical weight to create a Fetish? If so, what was the purpose of Fetish and what kind of spirit was placed into it?

Looking for it should surely entail tracking the life and myth of Annie Moore. This could turn up as a very interesting bout of Urban exploration and going into forgotten and changed parts of NY, and allowing the players to experience the city through different lenses.

Another option would be going into the Umbral reflections and talking with spirits who have been around for a while. Maybe even involving the City Father of New York?

Also there is a cool option of using ancestors to track down the tale of little Annie Moore. Maybe a spiritual quest in which the characters perform a rite that focuses on an Ancestor who lived in those times and they take roles of a pack in late 19th Century New York and fight local threats and issues while trying to figure where Annie Moore could have ended up and what her story was.

Was Annie Moore Finna kin? What happened with her? Wiki seems to tell us she married a German fishmonger and they had 11 children. That's a lot of folks who might have had their hands on her passport. Then again with her coming to the US, I doubt she ever wanted to go back to Ireland, and maybe he passport was not important to her?

What if a faction that takes more notice of the metaphysical and symbollical took notice and liberated her Passport? I could see Changelings or Mages quite keen to obtain such an item for their own purposes, and maybe the passport was among them from early 20th century onwards?