Lost silver flute in a black case with unique stickers near the art museum in downtown Des Moines.

I lost my silver flute while walking in the downtown area of Des Moines, near the art museum. I had it in its black case and must have set it down while taking a phone call. It has a few unique stickers on the case, and it's really special to me since I've been playing it for years. Reward offered for its return.