Why didn't Patriarch Reliance take the Copper Mirror?

As those who finished reading may know, the copper mirror is a kick-butt super item. But oddly enough Meng Hao found said item in Patriarch Reliance treasure pavilion. The novel says in chapter 4 that Patriarch Reliance found it, and failed to discover what it was (at least according to the guy in the warehouse). That actually boggled my mind as we now know that Patriarch Reliance is really, really powerful. 

Does anyone remember why Patriarch Reliance actually set aside such a good item? 
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