The container is inside the garage on the shelf next to the vehicle.
The container is inside the fenced off room at ground floor opposite the garage.
The container is inside a room, upstairs, above the fenced off area.
Enter the main building. The Storage Container is in the first room.
As you get outside from the last room, around the corner is Storage 4 next to a mannequin.
The Storage Container is in the "Boom Maker" room.
The Ark Chest is right at the exit with the button that goes back to the garage.