Cream king-size duvet cover with sage piping

I realized yesterday around 3pm that my cream king-size duvet cover with sage piping is missing. It's from Ikea and soft cotton with a light blue zipper pull. There's a tiny coffee stain near the bottom seam and a small monogram 'PH' embroidered in the lower-right corner. I last used it at my apartment near the Lewiston Public Library on Main Street after laundry, and I think I left it on the bed or tossed it on the chair. It has sentimental value—my grandmother gave it to me, and I’d really like to get it back.