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I'm taking a wild guess.. do you own a convertible?
The light could be hooked up to the inside of the deck lid using power from the license plate light.
You do realize that there's a tiny toggle switch that turns the light off when the trunk is closed... just like your refrigerator! Honestly, I never really noticed if there was/was not a light in the trunk... If my car weren't 1.5 hrs away, I'd go look!