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It's not so much codes are missing, but rather, they haven't been released/found yet. WYSIWYG :p

Although, there is the Fanta Machine that WBMike has found.
...

Penopata hinted at a password in the irc today and thus was 20061212 found for the Infinity demo. A chicken box. ^_^

If you zoom in really close on this picture, you'll see the pass on the box...