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Some variants have plugs fitted to accommodate added Electrical components like on a 207 GT convertible there is a wired connector which runs alongside the Turbo intake pipe but there is no visible socket ?
I wouldn't bother with it as it can't be live form the ECU otherwise you'd have EML light & would be tracing a wiring fault & it may be not fused either
I also have a similar "loose plug" in the trunk. behind one of the side covers (i think the left one). i always understood that wiring harnesses were made as universal as possible, to accommodate multiple models with different options, as it is quite expensive to develop and produce 20+ variants for a single car.