What we call a vent pick or some such is documented to have been used at least by the militia as early as 1738 in my little database. Of course, they didn't call it by our modern name, they used the terms pick, picker, prickler or, more commonly, priming wire.
It's interesting to see that others find the pan set useless. I make use of both the pick and brush quite frequently. I don't use the brush on those days when the humidity is such that the pan residue turns to black mud, but most days it does a good job. I always brush the pan and surrounding area thoroughly at the end of the day, especially if I'm taking the gun home loaded. When hunting, I always pick the vent one time before I settled down in my spot..., it's easy, quick and cheap insurance, why not?
Spence