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User blog comment:PedroGuags95/New Assassin's Creed Brotherhood trailer/@comment-5919381-20101028203422/@comment-1153722-20101029084012
When Machiavelli is seen retrieving that thing from the guard, it says at the background that "laws are changed at the highest bidder." So, I guess it's just a corrupt guard giving something to Machiavelli in exchange for coin.
Plus, I wouldn't think they'd give away such a major part of the story, if what Rayne says is true.