Assassins creed shop quest final items?

i had recently asked the question is there an easy way to get the shop quests completed and found that you just have to kill couriers and theives and find all treasures. after doing this i still have to find 2 cardinal purple dye, 4 silk, 1 shrunken head, and 2 vlad the impaler coins. if you know where to find these in the war machines or secret location maps or another easy way to get them please tell me.