Blue quilted duvet cover with monogram M

I lost my blue quilted duvet cover yesterday around 3pm near the Fort Dodge Public Library on Central Ave. It's a king-size duvet cover from the Threshold line, solid cobalt blue with white piping. The fabric is soft but has one small coffee stain on the top edge, and there's a silver-thread monogram 'M' on the corner. I had it on the bed at my apartment on Central Ave, and I might have left it in the library parking lot after taking a call. It means a lot to me; it was a gift from my grandmother and has sentimental value. If anyone found it, please let me know—I’d really appreciate getting it back.