If there are no ride issues, no leaks, and it was my box, I'd forget about it.
Being particular about cars, I can understand your concern; however, both of the 986's that I have driven, made some noise when going over moderate bumps. Almost like the "pst" noise that a can of spray paint makes when you quickly press and release the top. It's most noticeable when the suspension travels over a speed bump or a driveway approach, in my experience.
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