Black leather briefcase with brass lock

Yesterday around 3pm I lost my black leather briefcase on Princes Street, Edinburgh, outside Waterstones near the Scott Monument. It’s a slim, slightly worn case with a small brass lock and a red fabric interior. Inside there’s a USB drive labeled 'Atlas' in the inner pocket and a handful of client folders. It’s essential for work, and I’m really hoping someone picked it up by mistake—missing this means delays for several projects and a lot of stress.