Always always always double box anything fragile. If you don't still have the original Mini box, find something around the same size & pack the Mini securely in there with plenty of padding to make sure it can't move--packing paper is generally inadequate for this sort of thing, you need styrofoam peanuts or bubble wrap. Shake that inner box once it's closed to make sure it isn't going anywhere. Then put it into a larger box as suggested with still more peanuts or bubble wrap. Again, make sure the outer box doesn't make noise when shaken, and everything should ship fine.