Did the dealer say what was causing it? Is there a cable or something that runs down there, or a loose plastic trim or something?
Being new, they should definitely fix it for you.. though as a backup option, audio shops can be good at finding/eliminating noises.
Cotton tape, foam and even some lubricants (TFPE, silicon spray etc) are useful for different types of rattles. Sometimes, trim screws just need tightening.
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