Credit to juiciness -> https://www.ozbargain.com.au/node/494630#comment-7933578
It's a Xiaomi Mi Mix 3. You know what you're looking for, especially that it's an official Australian Xiaomi ebay store with GST tax invoice included.
Oh and it's black.
A good deal if you want the 5G and cheaper than JB Hifi's $699 offer, but if you don't care for 5G, the older 4G dual sim with a SD845 6gb/128gb is $519.20 > https://www.ebay.com.au/itm/Xiaomi-Mi-Mix-3-Dual-Sim-6GB-RAM…
(I also realised the eBay add for the 128gb model has 64gb in the pictures within the description)