Black key organizer with blue USB drive

Lost my black KeySmart-style key organizer with four keys yesterday around 3pm. There’s a bright blue USB drive clipped to the side and a small round dog-tag engraved with the initials 'PP.' The oldest tool, a slightly worn brass house key, is also on the ring. I think I dropped it near the Northeast SD Medical Center area, around East 5th Ave NE by the Riverside Market plaza. This ring has my apartment key and my work USB, so I’m really hoping to get it back soon—it's important and has some sentimental value.