I went down the RMA route for my 3090fe. The process itself was flawless. nVidia approved the RMA within hours, just based off a video they requested.
The replacement card was new-sealed in retail box.
Sadly it still has coil-whine, but a bit less.
So yea... sadly it seems the odds of getting a whine-free FE card is very low. At least from my own experience and the general posts about it. Seems some people get very lcuky... but most seem to have whine.
Further... seems lots of the AIBs do too this gen. I always wanted to get a Suprim X, but never managed to snag one, as I have seen fewer reports of those whine-ing. But the cost of them over the FEs now is insane... so I UV my card and its 'manageble'