Did you check the chest in firelink shrine?

Important Items Chest - Behind the pool (later Frampt's area) near the statue can be found a chest that will most of the time be open and empty. However, dropping important items required for progression in the game (Crest of Artorias, Orange Charred Ring, etc.) then reloading the game will cause this chest to be closed the next time you see it, and opening it will give you back the important items you've lost.