I'm not sure about that SAR standard. The only thing I know for sure that the government has gotten from coinbase is data about users who've made large withdrawals (over 20K I think).

And you pose an interesting point about illegal search and seizure. It seems they think that law doesn't apply to data as the NSA pokes around everywhere all over the globe, even into the affairs of other world leaders. This crap is getting way out of hand.