The storage entrances mostly tend to be hatches on the ground scattered throughout Broken Valley. They can be pretty tricky to spot, so you may want to comb the place.
Once you get unlock a storage, you can go inside and loot the place.
And you don't need to remember the password yourself, the game will do that for you.
Last edited by WotanAnubis; 16/11/10 10:26 PM.