Red-bound notebook with green ribbon bookmark

I lost my red-bound notebook yesterday around 3pm outside the National Library of Greece on Panepistimiou Street, right near Syntagma Square. It's a well-worn paperback with a red cover, frayed corners, and a green ribbon bookmark that sticks out when I close it. On the back cover there's a small Acropolis sticker I added last summer. Inside are handwritten poems, a few personal notes, and some pressed receipts. It really matters to me; it holds a lot of memories and a few work ideas. If anyone found it, please help me get it back.