Black Anker PowerCore 20k charger with red cable

I lost my black Anker PowerCore 20,000mAh portable charger yesterday around 3pm near the Worcester Public Library on Main Street. It's a matte black rectangle about the size of a small paperback, with a slightly scuffed bottom from a few drops, and there's a small red sticker with my initials 'PS' on the side. The attached red USB-C cable is still plugged in, and it powers my phone through long workdays. It was a gift from my sister last year, so I really need it back.