Once a credit card company has charged off your debt and sold it to a 3rd party. Do you remain in their computer system? I'm thinking about disputing some charge-offs and my guess is that if they can't find my account in the system then they can't validate. Any help would be greatly appreciated

I don't know the answer, but it would seem unreasonable to me that they don't have record of your account any longer, unless these were very old.

It's 2009. All these financial companies back up their records daily and keep them stored at multiple off-site locations. I don't think you will ever be purged from their system, particularly with storage as cheap as it is nowadays.

But again, that's just my guess.