The ball from the final out of the World Series is quite the historical item. For teams that have gone long stretches of time between championships, that ball can take on mystical proportions, and even spark controversy over the ownership. Just look at the spat between the Red Sox and Doug Mientkiewicz over the ball that resulted in the final out from the Red Sox World Series victory in 2004.
While the whereabouts of the ball from the final out of the Kansas City Royals Game Five victory over the Mets may have been unknown, it turns out that it was in safe hands all along.