I've ran around Boston and already collected all of the collectables in the area but my challenge shows that I'm still missing 1 chest in Central Boston. I've bought the maps from the General Store and it still does not show the chest that I am missing. Is this chest something that unlocks later in the story perhaps? I'm on Sequence 6 if it makes a difference.
I really hope I'm not glitched. --- NEVER argue with an Idiot. They will drag you down to their level and beat you with experience.
Had the same problem, here's the post that helped me find it.
I saw several messages about this, but they didn't really give a definitive answer clearly. If you're missing one chest in Boston Central District, it is most likely the one located in the Green Dragon Tavern. If you've liberated this area, it is marked with a "Liberation Contract" symbol, and is in the Northwest part of the district. The chest itself is upstairs in the first room on the left. Cheers!
--- "Come all you Xeno scum and fallen heretics! Come face the one true might of the universe and wither under the Golden Throne's gaze!"