Gregory, I don't have authoritative answers, but my curiosity was piqued, and in poking around I found
Hope's page at the Australian Poetry Library. You've probably found it already, but perhaps it will be new to some.
I've only looked at it quickly, so I can't yet tell how many of Hope's books are represented there and how many are left out. I wonder whether the existence of sites like this discourages presses from doing the work of producing editions of collected works.