SurvivorNews.net recently reported that a reliable source close to the production of Survivor has confirmed that the final tribal council votes are stored in a "lockbox," and apparently there was even somebody in charge of locking it.
They quote their source as saying: "The camera recording the votes was left running and no one watched the voting occur. Supposedly the box won't be opened and the video won't be watched until production of the final episode begins."
Source: SurvivorNews.Net"