Vintage Star Wars action figure set (Kenner, 1983)

I lost my vintage Star Wars action figure set from the early '80s yesterday around 5:15pm. It's two figures—Luke Skywalker and Princess Leia—on blue Empire Strikes Back cards, both in decent shape with minor yellowing and Leia's bubble showing a small crack. They were inside a clear acrylic display case I keep on my bookshelf, and the bottom of the card reads 'Kenner 1983.' I was walking along Main Street in La Crosse near Riverside Park, by the Pump House Regional Arts Center, and I’m hoping someone picked them up and might know where they went. These mean a lot to me—we're talking gifts from my dad, and I’d be really grateful to get them back.