Red paperback Great Gatsby with shell bookmark found

Found a red paperback copy of The Great Gatsby this morning around 9:15am on a bench outside Coligny Plaza, near the Pope Avenue entrance on Hilton Head Island. It's a standard 5x8 inch paperback with a few creases on the spine and a bright blue seashell bookmark sticking out from page 78. There's a light coffee stain on the back cover and a tiny grocery-store receipt tucked inside the front cover, suggesting it's been read many times this summer. It clearly belongs to someone who loves the book and I’d love to see it back with its owner; if the finder recognizes this, reach me here in the app or at [email protected].