Well do you actually verify the authenticity of your purchases? It depends on the product category somewhat, some categories are absolutely rampant with Amazon

Well do you actually verify the authenticity of your purchases? It depends on the product category somewhat, some categories are absolutely rampant with Amazon knockoffs in a way that you literally cannot avoid by scrutinizing listings or eyeballing it. The first and only PC thermal paste that I bought on Amazon was from an official listing but I was delivered a straight up knockoff. The thermal paste company is a common knockoff target so they provide serial numbers that you can use verify the authenticity of your purchase. The knockoff product had the audacity to include a fake serial number, presumably because they know most people wouldn't bother checking. The knockoff paste is a slightly different shade of gray, but I only know that because I had previously owned a (verified) authentic paste as a point of reference.