If I correctly recall when uploading users via CSV and asking Moodle to create a password for them, the password field is filled with "tobegenerated" until the first password generation cron task creates the passwords and emails credentials to the users.
In any case you may check if the above holds true uploading a single user via CSV and asking Moodle to generate the password, then check the password field for that user in the mdl_user table (please note the "mdl_" table prefix may differ on your setup). Remember to temporarily suspend the cron task to be sure the password is not generated before you check the table.
Thank you Andrea. It appears that it is a hash that is dropped in there. Is the tobegenerated done as an MD5 hash or something like that?
Thanks!
-Chris