To this day, the quest is still bugged. I spent the entire day doing this quest up until getting the key for the key mold. Upon using the key on the mold, both of them disappeared, thus stopping me from completing my quest any further. I spoke to Ada to see if I could reaquire the mold, but nothing. So in my frustration I turned off my game and got extremely close to deleting it. If there is some way get back the mold other than talking to Ada, I'm all ears.