Lost rare 1988 Upper Deck Ken Griffey Jr. rookie card near Bethesda Terrace, Central Park.

I lost a rare 1988 Upper Deck Ken Griffey Jr. rookie card while visiting Central Park in Manhattan last week. I had taken it out to show a friend and must have accidentally dropped it while we were walking near the Bethesda Terrace. It's in great condition and means a lot to me as it was passed down from my grandfather.