Framed seascape painting with gold frame

I lost my framed seascape painting yesterday around 3pm. It's a 16x20 inch oil on canvas with deep navy blues, turquoise greens, and a touch of coral at the horizon. The ornate gold frame has a small dent on the top-left corner, and there's a barely legible signature in the bottom right that reads 'M. Rivera.' I had it hanging by the front door of my place along St. George Street, near the Castillo de San Marcos, and I must have missed it when I locked up yesterday afternoon. This piece was a gift from my grandmother, so it feels irreplaceable and I really need it back.