Mario Valdez Chicago White Sox 1998 Leaf Rookies and Stars Autographed Card - Rookie Card. This item comes with a certificate of authenticity from Autograph-Sports. Autographed. Comes fully certified with a Athletic Promotional Events certificate of authenticity. . If a product is unsigned or non game-used, a hologram will not be included. Mario Valdez memorabilia. Chicago White Sox memorabilia.