John Kerry is the back channel.
NZ GCSB gathers the intel, but can't get it to Kerry without arousing suspicions, so what do they do?
Podesta goes to NZ, and the a week later we have a shooting, whats the connection?
Hezbollah.
Kerrys daughter married Zarifs son, Zarif is in charge of Hezbollah.
They had a shooting to get rid of the opposition to the Hezbollah takeover at the CHCH mosque, so now GCSB can give its data to Hezbollah mosque, who arrange for the info to be taken overseas's by the natural movements of their followers.
The flash drives are then given to middlemen, who get them to Zarif, who give them to Kerry.
Crazy, but almost certainly true. They thought it was the perfect plan, till some Anon exposed them.
GCSB - Hezbollah - Kerry