Dragon proof box find

Mission Name: My box is stolen
Powerlevel Requirement: 12,000
Mission Requirements: Collecting the box
Powerlevel of enemy: 11,000
Rewards: Dragon Rader Proof Box, 3k power level 1,500 ki
Mission Description:
A box has been stolen you need to help the young lady to get the box back, It has a very important possesion within it, Your job is to track the box via the persons power level, Once you get the box bring the doll back to the little girl, She will let you keep the box which turns out is a dragon rader proof box