I think I'll pass on the personal sucking of the radiator cap to determine it's status.
So the last time this was an issue was nine years ago? From that I would speculate that about every 10 years, or less, someone manages to find the one cap that is not a recovery type.
Archrms, you best choose your cap wisely, the nine year window says it is time again for someone to choose a non-recovery type cap!