Dark brown leather briefcase with initials

I lost my dark brown leather briefcase yesterday around 3pm outside the Houston Galleria on Westheimer Rd. It's a slim, 16-inch Hartmann briefcase with a brass latch; the leather around the corners is slightly worn and the latch has a small scratch. Inside the blue fabric lining there's a tiny zip pocket that holds my grandfather's handwritten note and a black leather card holder with the initials 'PK' embossed on the front. It also contains some tax documents and a small family photo in a plastic sleeve. It means a lot to me—sentimental value—and I’d really appreciate getting it back.