Blue Penguin Classics paperback, The Great Gatsby

I lost my blue Penguin Classics paperback of The Great Gatsby yesterday around 3pm outside Waterstones on Broad Street, Reading. It's a standard Penguin Classics trade paperback, about 180 pages, with a slightly creased spine and a small coffee stain on the back cover. A blue ribbon bookmark sticks out from page 207, and there's a pink sticky note with my initials inside the front cover. It’s sentimental because it was a gift from my aunt, and I really need it back.