John Fitzgerald Kennedy, the 35th President of the United States, was assassinated at 12:30 p.m. Central Standard Time (18:30 UTC) on Friday, November 22, 1963, in Dealey Plaza, Dallas, Texas. Kennedy was fatally shot by a sniper while traveling with his wife Jacqueline, Texas Governor John Connally, and Connally's wife Nellie, in a presidential motorcade.
The presidential limousine was passing a grassy knoll on the north side of Elm Street at the moment of the fatal head shot. As the motorcade left the plaza, police officers and spectators ran up the knoll and from a railroad bridge over Elm Street (the triple underpass), to the area behind a five-foot (1.5 m) high stockade fence atop the knoll, separating it from a parking lot. No sniper was found. S. M. Holland, who had been watching the motorcade on the triple underpass, testified that "immediately" after the shots were fired, he went around the corner where the overpass joined the fence, but did not see anyone running from the area.
Of the 104 earwitnesses in Dealey Plaza who are on record with an opinion as to the direction from which the shots came, 54 (51.9%) thought that all shots came from the direction of the Texas School Book Depository, 33 (31.7%) thought that all shots came from the area of the grassy knoll or the triple underpass, 9 (8.7%) thought all shots came from a location entirely distinct from the knoll or the Depository, 5 (4.8%) thought they heard shots from two locations, and 3 (2.9%) thought the shots came from a direction consistent with both the knoll and the Depository.
So the jury is out on whether the shots originated on the grassy knoll. All we can say with certainty is that they did not come from this one.
The cache is a small magnetic container. You will need to bring a pen and a tweezers might help.