I RMAd my i5 7640x and just now got my replacement, which is another 7640x. The replacement is a used cpu. The PCB is thicker than my last one which is good I guess, but theres some sort of glue stuff around the IHS that my old one didnt have. I've never seen this before and it kind of makes me think the previous owner might have delided it or something. I havent gotten my ram back yet so I cant test the cpu.
https://ibb.co/VtPvNqN - photo
https://ibb.co/VtPvNqN - photo