Erik smiled. "Why don't you tell me?" This was a very special briefcase. There was no lock, no hinges. Only someone who could morph metal would be able to open it. Inside were all kinds of metals, all with different conductivity. Even if he hadn't loaded the briefcase himself he would have been able to name each metal and how many ounces of each.
(good luck~, feel free to make up whatever you want for the briefcase.)