Black JBL Charge 4 speaker with orange strap

I lost my black JBL Charge 4 speaker yesterday around 3pm near the Millennium Bridge by the Tate Modern along Bankside in London. It's a rugged portable Bluetooth speaker, about the size of a small loaf of bread, with an orange fabric strap attached to the top and a tiny dent on the bottom edge. The back panel has a faint coffee stain from a quick break while I was setting up for an outdoor rehearsal. It felt like a lifeline for weekend trips, so I’m really hoping someone picked it up and can return it. If you see it around South Bank, please reach out here so I can collect it.