Rare vintage stamp collection in red binder

I lost my rare vintage stamp collection yesterday around 3pm near the Yale Bookstore on High Street in New Haven. It's all tucked in a red faux-leather binder with a gold crest on the cover and a small sticker that says 'Worldwide Classics' on the front. Inside, there are stamps from the 1920s, including a couple that aren't common in any modern album, plus one stamp with a pale blue back. The binder is a bit scuffed and the inside pages show a bit of foxing. This collection was my grandfather's hobby, and I really need it back; it feels like a piece of him is missing.