I have (twice) been sold non-gen xtals in sealed Rolex packaging (though the packaging print did look questionable once I was made aware of the scheme). I am beginning to wonder if our Chinese friends are now manufacturing other 'Rolex' parts, aside from vintage bracelets, cases, Brevet crowns, faux Rolex (ETA clone) movements, etc?
As far as the bum crown goes, I would still try to make a claim through the seller. Not doubting you, Chief, but new Rolex parts just do not self-destruct like that. Something smells a bit fishy.