Round table

I'll share some statistics. Over all the games I've played, I've encountered dozens, maybe even more, of Control Boxes, but here's the thing: if we exclude cases where 1) a hero without Wisdom experience takes it, 2) it's taken when the hero already has Control, or 3) the Control (from books/scrolls) is acquired anyway within a day or two, the usefulness of these boxes was only noticeable in _one_ game – when the opponent had captured all the towns, and in the final stretch, I received all the magic (the opponent still caught up and defeated me a week later, but that's beside the point). I just remember these instances.
What about you – what percentage of Control Boxes actually changed the outcome of the game? I'm not counting the possibility of giving the acquired Control/Knowledge to a second hero/scouts.