Boxes gold in Mobile Strike

Mobile Strike us promptly out boxes on the map so we can collect them as a resource. We never know when they leave or where so we have to be careful to pick them up. This is gold containing boxes according to their level: Lvl 1: 10 Gold
Lvl 2: 100 Gold
 Lvl 3: 300 Gold
Lvl 4: 600 Gold
Lvl 5: 1200 Gold
Lvl 6: 1600 Gold