Curtis Leabu - Bottle of Milk

From AEWiki

Curtis is usually walking around inside the northeast wall. He will tell you that he has a secret and will tell you this secret once you bring him a bottle of milk. Return with the milk and Curtis tells you he saw a man hide something under a strange rock, that is probably valueable. Along the north wall youll find the strange rock (if you put your mouse over it, it will say strange rock). Click on it to recieve a worn pack as reward.