To get the Blacksmith’s hammer in Assassin’s Creed 3, fast travel to New York after talking to Big Dave. Once there, enter one of the General Stores in the east or center and purchase the ebony hammer handle and the hardened steel hammer head. Both items are located under “Citizen Mission Items”. After purchasing, take the tools back to Big Dave where the mission started.
It was recently announced that thieves stole a truck containing copies of the PC version of Assassin’s Creed 3 that were bound for sale in Belgium, Luxembourg, and Netherlands. While the launch of the game wasn’t affected, those who pre-ordered the “Join or Die” edition are out of luck because that version can’t be re-manufactured.