Lost full-sized soft blue duvet cover with a subtle white cloud pattern near the central library park in Coventry.

I realized I lost my favorite soft blue duvet cover after visiting the park near the central library in Coventry. I might have accidentally left it on a bench or in my car while I was unpacking. It's a full-sized duvet cover, and it has a subtle pattern of white clouds. If anyone has found it, I would really appreciate it if you could let me know.