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According to Greenwald there were millions of pages, largely because everything from parking spaces to nuclear weapons were frivolously marked "top secret" in order to increase the perceived importance of bureaucrats.

Snowden gave the pile to the Guardian (Greenwald and another journalist), who decided what to publish, which was a major task because of all the unimportant stuff.

How could Snowden have gone through that pile in a couple of days while on the run and possibly afraid for his life?