Vintage stamp collection in red leather album

I lost my vintage stamp collection yesterday afternoon around 3pm near the Portland Museum of Art on Congress Street in Portland, Maine. It's tucked inside a red leather-bound album, about 9 by 12 inches, with glassine sleeves and a few loose stamps peeking out. The album has a handwritten label on the front that reads Anika's Stamps in pencil, and one stamp features a rare inverted-rose design that's easy to spot. This collectors item means a lot to me—my grandfather started it—and losing it feels personal. If anyone found it, please reach out; I’d really appreciate getting it back.