Have found out who Fred was! Fredrick (Fred) Alfred Hooker was Stephen Hookers son.
It would seen that Fred was using his fathers real photo postcards.
The following information was found on the " AIF Project" website.
https://www.aif.adfa.edu.au/showPerson?pid=142359
Frederick Alfred HOOKER
Regimental number 3361
Date of birth 5 January 1889
Place of birth Waratah, Tasmania
Religion Methodist
Occupation Foreman
Address Sebastopol, Ballarat, Victoria
Marital status Married
Age at embarkation 27
Next of kin Wife, Mrs Elizabeth Jane Hooker, Sebastopol, Ballarat, Victoria
Enlistment date 27 October 1916
Rank on enlistment Private
Unit name 2nd Pioneer Battalion, Reinforcement 8
AWM Embarkation Roll number 14/14/4
Embarkation details Unit embarked from Melbourne, Victoria, on board HMAT A7 Medic on 16 December 1916
Rank from Nominal Roll Private
Unit from Nominal Roll 2nd Pioneer Battalion
Fate Returned to Australia 4 June 1919
Family/military connections Brother: 2948 Pte Gordon Edgar HOOKER, 8th Bn, returned to Australia, 12 May 1919.
Other details
War service: Western Front
Medals: British War Medal, Victory Medal
Date of death 21 August 1982
Age at death 93
Place of burial Cremated: Rookwood Crematorium, Sydney, New South Wales
...R.E. - Moderator]
