Probably the crazy number of accordion folds in there. It has to be to increase surface area, but some people might be unaware of how that looks on the inside?

Maybe the fact that the heat sink is shiny and clean while the rest is grimy and gross? I think you would normally expect there to be lots of dust on the fins, deposited by years of convection. On the other hand, since the cover is off, it's probably reasonable to think they've just replaced the part? Idk, I'm guessing (about all of it).