Of course these are reprints of American strips (which was my point; I think someone may have thought I was serious about Elias and Australia). I don't think copyright played a part. According to Wikipedia :
With the onset of World War II the Australian Government placed a ban on the importation of American comics and syndicated proofs. As a result, the local comic book industry flourished. Following the war, Australia incurred a huge national debt: local publishers found they had a captive market as import restrictions continued to be enforced, at the same time the modern American style comic book (mostly sans color) was adopted. In its Golden Age Australian talent produced exciting creations such as Yarmak, Captain Atom, Tim Valour, Crimson Comet, The Panther, The Raven, The Lone Wolf, The Phantom Ranger and many others. September 1948 saw the debut of The Phantom by Frew Publications, the longest continuously published comic book.
According to the article, importation of American comics resumed in 1959. Looks rather like Consolidated Press was trying to dodge the import restriction by pretending its comics were home-grown