Vintage coin collection in red leather binder

Found this vintage coin collection this morning around 9:40 am behind the Tyson Events Center parking lot in downtown Sioux City. It’s kept in a dark red leather binder with gold embossing that says Coin Collection on the front. Inside there are coins from the 1800s through the mid-1900s, some with a brown patina and a few showy mint marks. A small sticky note with the initials 'J.S.' is tucked into one pocket, and there’s a tiny sticker on the inside cover labeled 'K-112'. I’m hoping to get this back to its owner, since it looks well-loved and clearly meaningful to someone.