so.....spooks?
I’ve never had a spook leave an item that came from someplace else, but I suppose it is possible.
I much prefer a spook leaving stuff, wanting to be noticed, etc-they are not a physical being, and are not into harm.
I would worry about a living person getting past garage guy’s multiple security systems on the property, and leaving things, because they are up to no good. If it happens again, I will set a little trap of my own after dark...
Racist.