Final fantasy xii how to get the zodiac spear?

Can I get the zodiac spear even if I opened the treasures you mustn't open if you can how?Final fantasy xii how to get the zodiac spear?
The Zodiac Spear is located at the secret area of Henne Mines, which

is accessible only after you have complete all the Garif's mark hunt

and commanded 10 Espers).



You will need the Diamond Armlet but the chances of getting one is

EXTREMELY slim (1 out 1000 chance or 0.01%). This is because of the

chest has 10% chance of respawn and you have only 1% chance of getting

the spear.



So if you want a Zodiac Spear so badly and lost your chance to get it

before you trigger one of the chests, getting the spear this way is

not a recommended solution unless you are ready to devoted your time

to get this... Restart the game or use a Gameshark will be more

sensible option IMO.Final fantasy xii how to get the zodiac spear?
Once you open that treasure chest that you weren't suppose to open, you cannot get the zodiac spear. You have to start the entire game over.