If you unpack the game from the container you lose the unlock. If you really need to run the containers from your external USB drive and want to keep the unlock you can do so by using 360Dashit:-
http://forums.xbox-s...howtopic=701158There is also an indexer that will create the ini file for you after it scans your content folder:-
http://forums.xbox-s...howtopic=701158Read both threads fully and you should be good to go.