In the 1920 census, "Aucland" is in New Rochelle, Westchester, New York, still an insurance agent (working on own account). With him are his wife, Berniece, and children: Paula B, 20 b. England, immig 1903, and Sandys(son), 13, b. England, immig 1909. It seems strange that each child was born in England by a woman living in New York who was born in Minnesota. Could these children be adopted from one of Auckland's sisters? In the Free BMD website, it has Alice's marriage to William Henry James. She is listed as the following: Alice Vernon S Cordner, Alice Vernon Sandys-Cordner. Seem like Sandys, the son, may be related to her. In 1910, Auckland and Bernice have been married 19 years and only have 1 child, born in England, to show for it. Where is Sandys? Is he still with his birth mother in England?
In 1930, Bernice is still living in New Rochelle and is listed as a widow. Therefore, the possibility of getting a death certificate for Auckland, is highly probable. He has to die between 1920 and 1930, most probably in New Rochelle, Westchester, New York. I also found Marriage licenses for both Paula P (1924), and Sandys (1926) in New Rochelle.
A final thought, with Auckland being such an unusual name, I looked for the frequency of it in England and there are a lot of them. Could Elizabeth's maiden name be "Auckland"?