I think you are right.
Messages on box 1 and 2 can't be both true or false. One has to be true and the other false. Since they can't be both false, then message on box 3 is definitely false. So gold is on box 3 and message on box 1 is true.
I think you are right.
Messages on box 1 and 2 can't be both true or false. One has to be true and the other false. Since they can't be both false, then message on box 3 is definitely false. So gold is on box 3 and message on box 1 is true.
More importantly is the explanation, so that it is clear to everyone, because the ones I read I couldn’t understand