I suspect that these blocks* were only installed in the car, after it rolled of the production line for storage and / or transport to everseas destinations, ex Stuttgart.
I don't know of any instance of them being installed even for temporary reasons, by an Australian owner.
It is perhaps reassuring to have them, if your car needs transport on a tip tray breakdown truck. With a collapsed suspension, it would be impossible to get the car hauled onto the truck, when the ground clearance is virtually non existant.
Having said that, I don't know of any owner who normally carries suspension blocks in the car.
* I didn't even know that these blocks had straps or cables attached. I have seen a few sets of blocks on display at concours , but I don't recall seeing straps or cables attached to any of them.