I found some more posts with the same tripcode. There are some interesting ones where the tripcode was related to Milkribs in some way. Maybe it's just coincidence, maybe he used the tripcode before, maybe he's Milkribs, or something else....
Anyway,
http://dis.4chan.org/read/lounge/1258928301 related to milkribs kind of.
http://dis.4chan.org/read/lounge/1251202144/
alright /lounge/, im gonna track milkribs' IP, brb.. (DJ)
Do you want to have some sort of an /lounge/ meet up! (Milky)
http://dis.4chan.org/read/lounge/1250843719
Some fag on omegle wants tell everyone about 4chan. Poor bastard didn't even know what a tripcode was, but I lied and said it's bbcode. (DJ)
BBCODE tripcodes! Sounds like a good idea to me! (Milky)
I'll investigate more.