> “This is not traffic you would encounter outside of Google's internal network,” said one of the experts. The slide shows data in a format that is “only used on and between Google machines.

So, the NSA had physical access to data on-the-fly (obviously, that would not be how you get data that was authorized by a court order). 2 possibilities:

a) They went ahead and broke in physically, or

b) Google installed a tap for them.