Wait. Hold on. I've veered off the point. We are victims here!
Items left behind: valuable construction tools.
Items taken: small bungee cord, clip-on sunglasses, ear bud for cell phone.
So to those tricksters who performed this little treat, here is my advice: If you were looking to find some valuable things for quick resale, you left those behind so you should probably consider another profession. If you were looking for something cool to add to your Halloween costume tonight, well, uh, I'd love to see what you do with that little bungee cord....