This appears to be an old thread, but I too have an unusual sound coming from the back of my car. Seems to be "timed". About 5 minutes after I start my car, I get 5 taps in succession that seem to come from the trunk. No indications that anything is wrong, just "tap,tap,tap,tap,tap". They're faint enough that if I have any throttle going on, I can't hear them, but at a light they're quite noticeable.
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