Red binder with rare 1950s stamps

I lost my red leather binder with rare 1950s stamps yesterday around 3pm near Market Street by the Potsdam Farmers Market and the town library steps. It's a small, well-used binder about the size of a lunchbox, with a green ribbon bookmark sticking out and clear sleeves protecting the stamps. Inside, the standout item is a 1951 Canada stamp in the top row, plus a few misprints and a tiny orange sticker labeled A-23 on the inside cover. The binder itself shows wear along the spine, and one corner is slightly frayed. This collection means a lot to me—it was a gift from my grandfather and holds sentimental value. If anyone found it, I’d really appreciate getting it back; I can offer a small reward and my gratitude.