Idea for S3 to avoid leaking of spoilers

So, since we know the winner of both season 1 and 2 has been leaked since the show started, my idea for season 3 is this: at the final two game, there are 20 boxes. Production make various games (18) and each game winner get a +1 box to pick. Out of 20 boxes, only 1 has the 5 million. At the end, they each pick one box each, till they both have the total of games won +1 (so they both have at least one box...)

Now, To avoid spoiling the winner, why don't u postpone the boxes choice and selection to the last week of the show? Like if the last episode airs the 27th, you record the boxes choice during the week before the 27th... or, maybe ven better, live on a special date near the 27th!

What do you think?