Some were addressed to his parents and a few aunts.
Another eight appeared to be love letters to different women across the world - from Russia and Latvia to the Ukraine and Germany.
The postcards, including one written to "Little Golden Retriever Baby", were similar.
"How are you?" he would ask, before describing Auckland as a small but busy city, "like a mini Sydney".
Each was signed off along the lines of: "I am thinking of you, I love you and miss you."
There was also a personalised stamp on each of them.
The postcards are now on their way to his many girlfriends.
Mr Ljunggren called the officer a "true sailor".
"You know, one woman in every port."
The officer arrived in Auckland on the Royal Australian Navy's largest amphibious ship, HMAS Choules, which was docked at Princes Wharf, right outside Barabra Cafe.