Denied.
It was added to avoid command and feature abuse. The players used /saveloc to save the locations of all mystery box and use /gotoloc to get mystery boxes( well, even server choose the pos randomly from the position list...the cmd /mysterybox does help ). The players were supposed to find the mystery box, but they used /gotoloc until they get the advantageous reward such as 'hide marker', it is a misuse of the mystery box feature. You should not be affected by the problem unless you used /gotoloc to get the mystery boxes.