I bought a new Ryzen 3700X on Amazon (sold by Amazon, not a third-party seller). The CPU was in a security-sealed retail box, and the serial number on the label matched that on the CPU, but the thermal paste was not intact on the cooler, which makes me wonder if I got a used cooler and possibly CPU.
Am I correct in inferring that this cooler is used? If so, why would a used cooler be in a sealed AMD box, and what should I do now?