The bank vault at Beacon Hills First National has been used twice is a prison. First, to keep Boyd, Cora, and Erica from seeing moonlight for three months, and second as a sacrificial location for Alan Deaton.

 

 

The bank logo keyed Sheriff Stilinski into Alan Deaton's location. 

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A photoshop brush for the Beacon Hills First National symbol can be found here: http://wincestsounds.deviantart.com/art/Teen-Wolf-Beacon-Hills-First-National-Bank-Logo-375982835