>>16701755
>The box was chosen at random.
Yes
>Yet you somehow guarantee that you take gold from it
It's a given that you take a gold from it. That wasn't a given when a box was randomly selected. All that's guaranteed is the outcome is the outcome.
>That is a contradiction indeed
It's a tautology, not a contradiction.

A thing does not have to have been guaranteed to happen to be guaranteed to have happened. You genuinely don't seem to be able to tell these two concepts apart.