Framed original watercolor, river sunset

I lost my framed original watercolor yesterday around 3pm near the Cambridge Courthouse on Court Street. It's a small to medium piece, about 12x16 inches overall, with a gold-tone wooden frame that's a bit scuffed on the lower edge. The painting itself shows a river at sunset—pink, purple, and orange skies reflecting on calm waters, with a simple sailboat sketched in the distance. I signed it 'L. Reed' in the lower right corner, and there’s a tiny coffee ring on the back of the frame from a cup I set down during a quick stop at a cafe. It has sentimental value; it was a gift from my grandmother, and I really need to get it back.