Limited-edition silver coin set in red case

I lost my limited-edition silver proof coin set yesterday afternoon near the Hawthorne Hotel on Washington Street in Salem. It's a two-inch round coin with a lighthouse crest, housed in a red faux-leather display case with white velvet lining; the case lid has a tiny scratch and the bottom edge bears serial number SN 1704. The coins themselves are in mint condition, with just a touch of tarnish around the edges. This collection started with my grandfather and means a lot to me—it's sentimental and I really need it back!