Silver heart necklace with engraved initials

I lost my silver heart necklace yesterday around 3pm near the Bozeman Public Library on Main Street. It's a 16-inch sterling silver chain with a small heart pendant about 8mm and a tiny star charm that dangles near the clasp. The back of the pendant is engraved with the initials 'L+M' and the clasp is a bit stiff from wear. This necklace has sentimental value — it was a gift from my grandmother, and I really need it back. If someone found it, I’d be grateful to hear from you and we can arrange a pickup downtown Bozeman.