I want to buy cpu from Aliexpress, 7800 x3d to be exact. PCBG warned me that Im gonna get scammed by chinks but the price on Ali is 50 bucks less than in local stores so its worth a bit of risk?

Are Pc components on Ali legit? All I know is I have to choose seller with lots of items sold, lots of reviews and it should be ok. Anything else I need to know?

Also if anybody knows, where are chinks getting these cheap cpus? Are they used?