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My A2 has the same build date as yours (Was a replacement from apple) and i noticed The vibrations while still apparent were massively reduced from my previous A2.
I also think the alluminium casing feels different...If thats possible??

well....sadly I do not have any frame of reference my Air 2 was a new purchase at CostCo (they were selling a 128G SP Gray WIFI for $559.00)
 
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