I don't have that defect on my N802's so it's not present on all speakers.
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There are a lot of great $8000/pair competing speakers available. The B&W factory owes you a satisfactory explaination for this seemingly random occurring condition.
Their Quality Control manger can tell you if this is an acceptable condition to be shipped with. If it somehow is, it's origin would seem a stress of manufacturing. If they are shipped defect free, then there may be a stress (vibration or depressurization come to mind) problem during shipment which their packaging engineer should be made aware of. I believe the midrange driver ships with some sort of retainer device or screw. If so, it may be subject to overtorguing.
Please post the final outcome to this situation for those of us seriously considering future purchase of this speaker.