The FBI passed specific details about Kiwi films and internet users to police who used the information to help get a search warrant for Kim Dotcom's mansion.
The document, released by the courts, claims the now-defunct filesharing company Megaupload had copies of Love Birds, starring Rhys Darby, and Tracker, starring Temuera Morrison, on its servers.
It also includes details of Megaupload members based in New Zealand who earned money under the company's rewards scheme.
The details were disclosed to the Herald after an application to the North Shore District Court, where the extradition case will be heard in March next year.
Dotcom and three others facing extradition deny claims they were involved in criminal copyright violation through Megaupload, which commanded 4 per cent of the world's internet traffic before it was shut down.