Rare vintage coin set in leather case

I lost my rare vintage coin collection set in a black leather roll case, downtown Denver, yesterday around 3pm near Union Station and the 16th Street Mall. The case is about 5x3 inches, with a brass snap and a red velvet lining that's visible when opened. Inside are about 20 coins from the 1800s to early 1900s, some with a copper patina, and one coin with a small dent on the edge. A tiny sticker with the initials 'AR' is on the inside lid. It's listed under the Collectors Items category and is sentimental to me—a gift from my grandfather; I really need it back, so if you found it, message me here and we can arrange a safe meetup.