Cream flannel sheet set with gray damask pattern

I lost my cream flannel sheet set yesterday around 3pm. It's a queen-size 4-piece set from Target's Threshold line, with a subtle gray damask pattern. I had it drying on the back porch of my cabin on Main Street in Nevada City, Gold Country, near the National Hotel. There's a tiny snag at one corner and a faint coffee stain on the fitted sheet, both pretty discreet. A unique feature: one pillowcase is embroidered with a small blue monogram 'A.M.' that you can spot if you look closely. This set has sentimental value—it was a gift from my grandmother, and I’m really hoping to get it back.