I can't tell if this is a documentation bug, or a missing folder :)

The Drupal-port-README.txt says,

The folder heirarchy is changed to suit Drupal. Each styles show up as different themes on Drupal theme administration page.

The style.css says,
@import url('sandbox-threecolumn-both/style.css');

So, I'm thinking there's supposed to be a folder for each of the default Sandbox styles. But ...

azumi:~/Sites/drupal/sites/all/modules chris$ tar -tzvf ~/Documents/src/Drupal/themes/sandbox-theme-5.x-0.x-dev.tar.gz 
drwxr-sr-x drupal-cron/drupal-cron 0 2007-07-01 12:12 sandbox-theme/
-rw-r--r-- drupal-cron/drupal-cron 14940 2006-04-23 21:54 sandbox-theme/LICENSE.txt
-rw-r--r-- drupal-cron/drupal-cron    46 2007-06-27 02:41 sandbox-theme/COPYING.txt
-rw-r--r-- drupal-cron/drupal-cron   151 2007-06-27 02:41 sandbox-theme/Drupal-port-README.txt
-rw-r--r-- drupal-cron/drupal-cron   437 2007-06-27 02:41 sandbox-theme/README.txt
-rw-r--r-- drupal-cron/drupal-cron   261 2007-06-27 02:41 sandbox-theme/block.tpl.php
-rw-r--r-- drupal-cron/drupal-cron   167 2007-06-27 02:41 sandbox-theme/box.tpl.php
-rw-r--r-- drupal-cron/drupal-cron   500 2007-06-27 02:41 sandbox-theme/comment.tpl.php
-rw-r--r-- drupal-cron/drupal-cron   218 2007-06-27 02:41 sandbox-theme/layouts-readme.txt
-rw-r--r-- drupal-cron/drupal-cron   612 2007-06-27 02:41 sandbox-theme/node.tpl.php
-rw-r--r-- drupal-cron/drupal-cron  2475 2007-06-30 17:57 sandbox-theme/page.tpl.php
-rw-r--r-- drupal-cron/drupal-cron 33835 2007-06-27 02:41 sandbox-theme/readme.html
-rw-r--r-- drupal-cron/drupal-cron 27423 2007-06-28 03:49 sandbox-theme/screenshot-large.png
-rw-r--r-- drupal-cron/drupal-cron 10595 2007-06-27 02:41 sandbox-theme/screenshot.png
-rw-r--r-- drupal-cron/drupal-cron  2710 2007-07-01 08:04 sandbox-theme/style.css

There ain't, not in the one I downloaded anyhow.

Is there another file I should get?

On the other hand, it's super-plaintxt now :)