Access to old files

Hi! I am one of a team of three that was using Box previously. The other two users no longer have the emails on this account active, but mine is still able to login to a free plan. I am hoping to access all the files we had saved here before the account was closed. Are we able to reactivate the subscription and see the old folders? I do not see any of them in my free account. We do not want to sign up with a new empty plan, just pay to access the old one. Please advise. Thanks!