Palm-sized silver keepsake tin with a pressed rose

Yesterday around 3pm I lost a palm-sized metal tin on Cannery Row near the Monterey Bay Aquarium. It's matte silver with a light-blue lid, about 2.5 by 3 inches, and the lid is engraved with the initials 'PP'; there's a small dent on the corner. Inside is a dried white rose from a bouquet and a tiny laminated note I wrote to myself. This box is sentimental—it was a gift from my grandmother and the note reminds me of her, I’d really like to get it back. If anyone found it, please reach out; I’d be grateful to have it returned.