Understand, I have a Buddie in the PNW who did the same, except here (PNW) Rain & Time,,, they (Containers) puddle & rust thru the roof ruining the "tons" of used (parted cars) and nos parts inside,
Shame, he stored 'Ikea' furniture in the dry garage and lost the battle of the elements to the GM parts horde in the sealand containers, & I mean CONTAINERS full, PIC to come someday, if he lets me snap a few shots
Lesson well stated above.
Sorry about hat,
Jim