The rattles are a general 'quirk' of most Seat Leons inc Cupra. The majority would have it, the odd lucky few, may not have the rattles, or are not bothered / can hear them. Me, they bother me, my Leon had mutiple rattles and fixing/silencing each one uncovered quieter rattles. My Ibiza Mk5 facelift, had no audible rattles no matter how hard I tried to find them, likewise my current Volvo V40 has 0 rattles. It's like a lottery with Seat, most people don't win the lottery, hence they have rattles, the lucky few who win the lottery, like with a Leon/Cupra, don't have any rattles.