Here's a couple pictures of the original machine. (apologies for the bad angles)
I have identified the Apex Supercase 100-G2-P4 as being a close match, with the only identifiable difference being the lower half of the front panel being laid out differently.
An example of an exact case match to the machine is this listing for an AMD Duron machine on eBay.
Regarding the inconsistencies relating to where the front USB ports are on these cases-- they're 5.25" inserts. It's way more noticable on the image of the Duron listing than my original one-- zooming in it becomes more obvious.
[ edit - 4h after post ] Another match found. Still no known searchable name? I would buy this if I were actually in Australia