Blue U.S. passport near Main Street Square

Yesterday around 3pm I realized my blue US passport was missing somewhere around Main Street Square in downtown Rapid City, West SD, near the Mount Rushmore Road and 7th Street corner. It's the standard blue cover with a gold emblem, and the inside shows my name handwritten in pencil on the first page. There's a faint coffee ring on the back cover from a cup I was carrying earlier, and a small crease along the bottom edge. This passport is essential for my travel plans next month, and I am really hoping it turns up so I don't miss my trip.