Found vintage coin and stamp collection in Fargo display case

I found a small red velvet-lined display box this afternoon around 4:15 pm outside the Fargo Theatre on Broadway in Fargo, North Dakota. The box is about 6 by 5 inches with a clear lid and a brass latch that still shines. Inside there’s a vintage coin collection—roughly 25 coins in various patinas, some with nicked edges and a couple from the early 1900s. There’s also a tiny binder of stamps with a green label and a handwritten tag that reads 'North Dakota Numismatics Club.' One coin bears a mint mark I can’t fully read, and a stamp shows a distinctive green cancellation. If this belongs to someone, I’d really like to help reunite them with it.