Lost & found percussion instruments in London

Red Pearl snare drum with sticker

I lost my red Pearl snare drum yesterday around 3pm outside the Southbank Centre along Belvedere Road by the National Theatre in London. It's a Pearl Export series 14x5.5 inches, with a few scratches along the rim and a small chip on the edge. The shell is a bright metallic red with a white Pearl badge and a dent at the bottom hoop. There's a blue painter's tape sticker on the shell with my initials AY and a tiny heart drawn on it. It has sentimental value to me; I've used it in every rehearsal for the last two years, and I'm really hoping someone picked it up and would hand it back.