Ended up with 428 and had to look around a bit for the last two... got them by using egg vacuum around the beginning of the room with the last defense system.
439
1/9
05-19-08
Found a way to backtrack to the beginning... also picked up an extra ring at the last defense system apparently. Vidded.
449
1/9
05-20-08
thanks to OmegaDJ for pointing out a 10 box I missed... took me like 10 minutes to find the last extra ring at the defense system though.