Fallout 76: Research the key - Cold Case

Research the key is an objective in Fallout 76 (F76).

Quest

Travel to Clarksburg, to the South of Wavy Willard's Water Park.
Head into Clarksburg from the West, going East up the nearby road.
Go along the Southern face of the first set of buildings and enter into the fourth building, the Post Office.
Get behind the counter and interact with the Clarksburg Public Records Terminal terminal.
In the terminal, opt for [Search by Box Number] and then [Box 012].