Autographed 1952 Topps Mantle card lost

Yesterday around 3pm I realized my autographed 1952 Topps Mantle baseball card was missing. It's tucked inside a small tan leather-bound binder, with the card in a clear sleeve and Mantle's blue signature visible. The binder rides in a blue pouch with a red '12' sticker on the spine, and I last had it when I was sitting outside a cafe near Clinton Square in Syracuse. This card has huge sentimental value for me because it's a gift from my grandfather, and I really need it back; if anyone finds it, please contact me—I'd be forever grateful.