Not that Luca wants to hear more bad news but heads up on this issue. A couple years ago, the polished front cowl on my garage queen' '17 began to show signs of 'pox' under the shine throughout most of the surface. Turns out, it was magnetic not stainless as it was supposed to be. Thankfully, it was replaced by my dealer under warranty without question. Bad batch of metal.
The cowls on early cars were indeed stainless steel, painted or polished. Later cars circa 2017 onwards the cowls were made from mild steel and were painted or chrome plated.