Oddly, I have some DC Stars boxes. I might also be able to help with the latest Rittenhouse Marvel and Cryptozoic DC depending on how many you want (I have some cases sitting at home waiting for me to open them in April).
Why do you want unopened boxes? I am a specialist DC collector and I have to warn you that some of the 1990s DC cards haven't actually survived that well if unopened. For example, the chrome cards tend to have stuck together. Also, these older sets don't have sketch cards or other unique cards and their collation can be awful (it took me something like 4 boxes to put together the DC Pepsi set) so you are often better off just buying the set - not as much fun but much cheaper, especially if you have to pay for shipping to Australia.
Anyway, let me know what you are looking for (by PM preferably since I don't check the site often).