storage is a number that is given to every quest, or better say "action".. its like a checklist... if u have done a quest, the storage number will be posstive (1) but if not, its gonna be negative (-1)...
without that, quests wouldnt work or people would be allowed to take as many rewards as they want.
so,
1 = yes (done the quest with a certain storage)
-1 = no (havent done a quest with a certain storage)