Australia Zoo ran a tv/radio ad saying something along the lines of "come meet our gorgeous Sumatran Elephants" when Christina and Widya first went on display (an ad that didn't specify that they were actually on display, because I'd just assumed they were talking about paid encounters when I visited, and was absolutely blindsided to see them out of display for what was the second day of them being so)
Since then, they've been relegated to just the occasional few second clip in an ad, a single billboard, and some social media posts.
Honestly, for the only Elephants in Queensland (and only Sumatrans in Australia, though I don't expect the general public to really know what that means, let alone care) they're shockingly under-advertised.
Even the freakishly expensive paid encounter was barely advertised, which is incredibly surprisingly, considering you actually went in the enclosure with the elephants. I don't believe I ever saw a single advertisement for that, be it on tv, social media, or even in the zoo itself.
But to be fair, it is Australia Zoo. They prefer to treat the celebrities that inhabit the zoo as the attraction more than the actual animals.