I came here to ask the same thing. I used the page to effortlessly check remaining warranty on 2nd hand EVGA cards without needing to contact a human at EVGA or register the equipment to my account; The warranty check page was available to use for something like a little over a month I think. But now it's gone again as of about a day ago.
I'm not talking about guest RMA either. It was a warranty check page that you entered in the serial number, and the page would spit out the model number of the video card and the remaining days warranty in green color, or "out of warranty" in red color. It looked exactly like the picture in the original post up top.