Further information provided by Sarndra Lees:
Historical births, deaths and marriages list his name as Walter Guy GREEN son of Amy Annie and Frederick Whittington GREEN, registration number 1879/10211.
Mentioned as coming home onboard the Ruahine
Evening Post, Volume XCVIII, Issue 129, 28 November 1919, Page 3
His South African military records are available to read online
Funeral notice for Walter’s wife:
Evening Post, Volume CXXXVII, Issue 79, 3 April 1944, Page 1
GREEN.—-The Friends of Walter Guy Green are Invited to attend the Funeral of his late beloved wife. May Caroline, which will leave our Chapel Tomorrow (Tuesday), April 4 1944, at the conclusion of a Service, commencing at 11 a.m., for the Karori Cemetery Robert. H. Wilson and Sons. Ltd., 164 Adelaide Rd.
Grave images, taken Waikumete Cemetery, 5 February 2012
82526, Sergeant W G GREEN, Wellington Regiment, S.A War and 1st N.Z.E.F. Died 13 August 1959, Aged 78 years