 In 2009 at the invitation of the New Zealand Film Archive, the National Film Preservation Foundation sent consultants Brian Meacham and Leslie Ann Lewis to assess its holdings of long unseen nitrate film prints of American silent films.The cache was found to include astonishing treasures of at least 75 American silent films unknown to exist in the United States, including a complete tinted nitrate print of "Upstream" and a trailer for another lost John Ford feature, "Strong Boy" (1929).The New Zealand Film Archive turned out to have many American films that had never been shipped back to the United States after they ran in theaters.