“Cargo containers, where the heck do they come from?”
Well, you see, when a boy cargo container and a girl cargo container like each other very much...
But seriously, cargo containers are generated by the manufacturing process for items (and droids?), and are broken down as soon as all their original contents have been removed. I don't think it's possible to store things in them other than as part of production - only remove.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."