I must say I am against the stadium being sold, as the money is unlikely to find it's way into grassroots football as they are saying. Having said that, if it is to be sold, it's probably better in the hands of an American rather than other nation buyers I can think of.
You could have said the same about FIFA just a mere couple of years ago. Just because nobody has photos of proof of these envelopes doesn't mean they don't exist.