A courier is a big risk, Porsche hard tops are made of quite thin aluminium and dent very easily. If distance is not too great a problem collect it with the car, but make sure you've got the screw inserts to fit to the car so the thing is fixed.
We've always had hard tops for our Boxsters - goes on in November and off by March. But they need care when manouevring (takes two to carry) and should be stored on a rack in Summer.
I think it's inconceivable for a courier to transport it.
I wouldn't risk it. 