Plot: When a seller comes in with an overcoat once owned by suspected JFK assassin, Lee Harvey Oswald, will the deal be a stroll on a grassy knoll, or will Rick lose his shot at owning a piece of history? Next, Corey checks out a 30-year-old Gibson guitar with a factory mistake. Can he pick up a sale, or will he get shredded? Then, a rare Mike Tyson Nintendo game punches into the shop