Lost: Vintage stamp album with rare misprint

I lost my vintage stamp album yesterday around 3pm near Market Street between 5th and 6th in Old City, Philadelphia. It's a black leather-bound album, about the size of a hardcover book, with gold embossing on the spine and a red ribbon bookmark. Inside there's a handwritten note from my grandfather and a few stamps from the 1960s, including a rare 1969 misprint—this is a true collector's item to me. The cover shows light wear, but the spine is intact; this collection has sentimental value because it was a gift from my late grandfather. I really need it back, and if you found it, get in touch.