Heres the packet the client sent:
0030 ff 0a 06 00 00 00 ......
According to BnetDocs (http://bnetdocs.valhallalegends.com/content.php?Section=m&Code=32), the format of this is
(STRING) Username
(STRING) Statstring for old products, Null for CDkey'd products.
The username is also nulled.
Holy crap, that was fast.
Thanks guys!