You will never know this, he's Warren for a reason. These guys often have proxies and off shore companies, then they have so many firms and investment and one of them could have brought it and hid it so well, that people will never even know about it. That's the way they become rich, they know to capitalize, I have a gut feel he owns it. For him it will be just a stock and he will easily buy it and sell it off, without anyone knowing, then convert the Fiat into one of his investment and he has his money back with profit.