Black leather briefcase with TSA lock

I lost my black leather Samsonite briefcase yesterday around 3pm outside Union Station, near the Wynkoop Street entrance in Denver. It's a mid-size case, black matte leather, with a silver TSA lock and a small red leather luggage tag bearing my initials 'M.K.' The interior lining is navy blue, and there's a faint coffee stain on the back corner along with a tiny snag on the zipper and slightly scuffed corners. Inside are a few client contracts and a worn grey notebook that I really need for tomorrow's meeting. If someone found it, I'd really appreciate getting it back—it's my work tool and I depend on it.