Consider for a moment you are the victim of theft. Would you still consider it theft if what was “stolen” was something of no value or use to you? What if someone is merely capitalizing upon your otherwise unused exhaust/residue? How would the transformation of something you personally had no previous use for cause you to reassess its value, and make you classify someone’s re-use/repurposing of your waste as “theft”?
If you were the manager of the convenience store, would you consider something of yours being stolen in this situation? If so, what? Light? Business? Convenience?