The eBay listed Nokia Lumia 1520 is a network test device and works on AT&T's pipeline, according to the seller of the phone. While the unit is a pre-production version, it does have the final design hardware and the final software is installed. The screen is lightly scratched.
This is apparently the second time that this particular phone has been put up for sale on eBay. The person who pressed the "buy it now" button the first time, never paid for the device which probably happened when the buyer realized he was better off buying the phone brand new from AT&T or Microsoft. With minutes left until the listing expires, no one has purchased the device.
source: eBay via WPCentral