Originally Posted by Oliver
Can you cite any hints that this other place exists, outside the "small golden land" itself, which could also mean the bank vault where boxes of cash are found?
The device that Erika was playing with after she and Battler solved the Epitaph. I'm supposing they were messing with some lock and 0715... was the code for it, which is why Erika was just playing around with it but was never able to open it. From the fact that the two were led to another direction towards the real gold and the place was seemingly locked, I'm guessing it must hold something of equal value to the gold.