What are you searching your directories with - a file manager such as Konqueror, or a command-line console ?
In e.g.Konqueror check Show Hidden Files in the View menu.
In a console
Code:
 ls  /home/<whatever-is-tycopolis-user-name>/.mozilla-thunderbird/knoppix/Mail
should show your mail folders.
N.B. The mail files contained will not be in filename.eml format, and could be very large; you would need to copy them into the corresponding location of a working Thunderbird system for convenient rendering.
Don't know the specific details for Evolution as I don't use it