Brown leather briefcase with brass lock

I lost my brown leather Briggs & Riley briefcase yesterday around 3pm near Union Station in Denver, outside the Train Hall entrance on Wynkoop Street. It's a 14-inch case with a brass lock that sticks a bit when you close it and a well-worn leather handle. The interior is charcoal gray with a small green luggage tag bearing my initials 'PP' on the outside corner. Inside, there’s a yellow notepad, a USB-C cable, and some receipts from a client meeting. This bag is important to me—it held a lot of notes from my late grandfather's study; I really need it back.