When car keys are misplaced, their location is unknown as well as their non-location. Therefore, they exist as a wave function in all locations which collapses upon observation of the keys following The Heisenberg-Schrodinger Lost Key Postulate. Which also hypothesized that you cannot simultaneously know the locations something isn't and not know where it is.
That party was wild, lost my keys but I found them in the FREEZER this morning! You really dont know where your keys aren't till you find them, totally like Schrodinger's Keys!!!