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It is likely the skeleton with the duffle robbed the bank shortly after the Great War, unaware that pre-War currency would no longer be viable.
Lexington Bank is a single story building located across the street from the Super Duper Mart. The front door has been knocked down and the side of the bank is broken. Some furniture and three cash registers are still present. Operating the wall terminal gains access to a vault. Several stacks of pre-War money are available. The back side of the vault has been demolished. Down below is a skeleton with several stacks of pre-War money on the ground and more in a duffle bag.
Stacks of pre-War currency inside the vault and outside the building in back. Location respawns for more loot.
Lexington Bank appears only in Fallout 4.