Sorry for the confusion. The sound is coming from the forward wall of the rear trunk between the engine compartment and the trunk. I don't think it's the latch release based on where the sound is coming from but C3 is partly responsible for the central locking system among other things so who knows...
It happens both when the trunk is closed and latched and when it's open. I now have my battery tender hooked up to keep the current battery from draining.
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