i take this daily quest, http://l2wiki.com/kicking_out_unwelcome_guests and when i go to seal of shilien to defaut de mobs, i never obtain the items i prove deleting the quet, and taking again
start killing, then make a game restart. notification should pop up. or go to the quest menu, find the quest, check it and tick the notification.
if you are in party with people who is not there (around you), you won't get the related quest items. so, do it alone. and you have to do the quest with the class you took the quest. there were some problems if you took that quest with main and then you were to kill the mobs on dual.