From the npc near the walls and while facing the wall, hug the wall and go to the right. Once you hit the end of the wall and are up a slight hill (47.7,32.6), turn to face the edge of the wall and use
CTRL+ TAB
or
/run TargetNearestFriend()
to target the box. No need to climb and buildings or use the green circle jumps. With "click to move" enabled, simply use auto attack skill to interract with the npc while running into the edge of the wall.