I received a late-model Hasselblad ground glass focusing back with the SWC but the previous owner had lost the storage box that came with it. Hasselblad USA told me they had never offered the storage box as a part, and it's a discontinued product now anyway, so I'm down to either hunting one up on the web or constructing one.
If you happen to have one kicking around, I'd be delighted to buy it from you.
thanks! Contact me via PM ... :-)