Navy blue king duvet cover with white piping

I lost my navy blue king-size duvet cover set with white piping yesterday around 3pm near the public library on Meigs Street in Sandusky. It's a cotton percale set from Linen & Co. with a smooth zipper closure and a small decorative white stripe along the edge. There's a faint coffee stain on the lower right corner and a tiny pull thread along the top seam that might catch someone's eye. It means a lot to me because it was a gift from my grandmother and I’ve slept with it every night since I got it—really hoping to get it back. If anyone found it or picked it up, please reach out; I’ll be forever grateful.