Overall that was an excellent post. Only point number three that was a bit hard to check, because that was hiding in other parts. But while we have a personal warranty from the seller (let say 2-3 days), we can check it at our place. And also we can do the stress test (as OP said that not posted here)
if it is interesting, I can write how to check the graphics card for authenticity, not fake from Ebay\AliExpress, or that the card matches its name and is not repainted in the BIOS