Treasures long forgotten by history have been uncovered beneath the surface in underground digs or hidden away in attics or storage spaces. In the case of a rare document nearly 237 years old, it was in a nondescript squat metal filing cabinet that had been sitting discarded and gathering dust in an eastern North Carolina home for who knows how long. Two years ago, a property was being cleared out in Edenton, North Carolina when a rare copy of t…