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The statistics in this report as well as most statistics that google or facebook would publish are probably related to run of the mill warrants. Picture a suspicious death is under investigation and the police want to check someone's private messages for clues. In dropbox's case they could be investigating child pornography or sharing copyrighted data. I actually think it's more likely that if any of the above organizations were served a request from the FISA court they would be obliged to not even publish the request in a total summary of stats.