To my knowledge this is the only time a triple steal has been pulled off in the history of the Cardinals. I have researched it quite bit without finding another. With that said, there are no comprehensive lists that I can determine it for certain, and I do welcome any corrections as long as they can be determined factually. I did find an instance where the Cardinals were the victim of a triple steal, which happened on August 29, 1955, as Jackie Robinson swiped home plate with base runners in trail. That game in 1917 was quite a game as Dots Miller and the boys stole their way into the history books.
Check out the box score here: http://www.baseball-reference.com/boxes/SLN/SLN191706140.shtml