Hi! If you never claimed the rewards for the bond level 5 mission for Gaara, it would still be active in the home screen for you to continue the mission. It is quite possible that you already claimed it, but if you have not, you may need to contact support directly and see what they say. From what I know though, there has been no known cases of an issue with the bond missions, however, it is always good to check it out, so please contact support directly. You can find it here.

~Jib