It was in 1989 that a man visiting a flea market in Pennsylvania allegedly found a folded parchment inside a cheap frame while looking for an old, inexpensive frame. At first sight, it appeared to be no more than some old paper stuffed into the frame, but it was a Dunlap broadside, which was one of the rare copies of the Declaration of Independence printed in July 1776.
The unusual aspect of the event is the discrepancy between the place and the item. This document was discovered not at the National Archives, museum, library, or auction, but in the common flea market, and this kind of disparity between the place and the historical value of the document is probably the main reason why this story is still told by many people.