Lost silver trumpet with engraved name left in its case at Lewis and Clark Landing picnic area.

I mistakenly left my silver trumpet in its case at the picnic area while I was attending a concert at Lewis and Clark Landing. I realized it was missing later that evening when I got home. It has my name engraved on the inside of the bell. I'm really hoping to get it back, as it holds a lot of sentimental value to me.