From what i've studied, the claim that you have it forever isn't always true. If your immune system is strong enough, hpv can get out of your system within a certain amount of time. For your sake I would suggest to just get tested again.
I had hpv which I caught from an ex boyfriend you do not always come up with genital warts!! Hpv is sooooo common about 80 percent of men and women have or have had hpv!! Even with out knowing it. I had a abnormal pap and came up with it and had early early stages of cervical cancer which I had a coloscopy done. So it isnt always true. Ever since I have had that cervical cancer I go to get a pap smear every three months so getting genital warts isnt always an issue.