Vintage stamp collection in green leather binder

I lost my vintage stamp collection in a green leather binder yesterday around 3pm near the Fisherman's Wharf gift shop on Cannery Row, Monterey Bay. The binder is about 9 by 6 inches with a brass clasp and a red elastic band that keeps the pages snug. Inside are sheets from the 1940s and a few rare US airmail stamps, plus a small sticker on the spine that reads 'A. Nakamura, 1973'. The cover shows a coffee stain on the back and a tiny scratch on the lower corner. This collection means a lot to me; it was a gift from my grandfather and has sentimental value. If anyone found it, please reach out—I'd really appreciate getting it back.