michele, from what I understand and from my personal experience, HPV warts can go away completely, or they can stay for awhile. It does happen that they clear up on their own.
It doesn't however mean that since the warts cleared up, that you are HPV free. You aren't ever going to be HPV-free, you might just not be experiencing symptoms.
I've read of a couple cases, where over time, you begin to appear clear of it, essentially, for some people, experiencing no symptoms for awhile, and then they will be begin to test negative for it.
So, hopefully, it was your good luck that they disapeared on thier own. I definately wouldn't take it as you are cured of it.