Vintage 1978 Star Wars action figure set

I lost my vintage Star Wars action figure set yesterday around 3pm near the main entrance of Bluewater Shopping Centre in Greenhithe, Kent. It's a small red-and-black plastic display case that holds three Kenner figures: Luke Skywalker with his orange lightsaber, Han Solo, and Princess Leia. The case is a little worn, with a faded Star Wars logo on the front and a tiny dent on the lid. These figures were a gift from my dad and feel really sentimental to me; I’d be incredibly grateful to have them back if anyone spots them.