Data Recovery, how to restore without a valid cpbackup file?

Hello there. I got a server that completely crashed. Since the data was on a secondary disk, I was able to recover the data. However, I now have a user.tar.gz file for each of my users, but that archive was made by me manually, since the server was dead. Each archive has all the mail, public_html, dns, logs structure, but it's missing a file since the archive was not done by cpanel backup system. "The extracted archive does not contain a valid cpanel user file." So. Any way I can manually generate the missing file, put it in the archive and restore it? Or, can I simply create each emails adress and move the files in each of their directories? But I think that will break the indexation of email? Public_html is an easy task, same goes for sql and even DNS. Its mainly emails that I don't know how to handle 100% manually. Thanks for your feedback.