[mothered]

Although on Amazon it says it weights 420 grams. Could this be the weight of the box and cpu together?

I haven't checked.

Is It listed next to "Item weight?"

The cpu can’t been seen externally BUT the box has a very odd design as you can see inside the box but the cpu chip itself can’t be seen.

If the CPU cannot be viewed In Its entirety, then you're good to go.

That's provided the weight Is within the EB/missing Item method's weight bracket.