OK, i am not suggesting you to redeem the six tail coz as ppl said, it can be pull from Jin treasure2 in future. But if you want to redeem one, here is the coupon you need : after the deduction of 1050 point that you can get it from box and finishing the mission in 7 day, you will leave 3510 point to go...so the total will be 7020 coupon in order to redeem utakata.