Another guard says,"Did you know that a bunch of moogles and a sasquach live in the mines. The sasquach home is very hard to get to but you can see him at the entrance to the new mine. the upper-right hand part."
The captian of the guards tells you," If you really want to know what is inside of the locked treasure chest, it is a Gold Hairpin, which will cut MP use in half."
Thanking them for their time, you head back.