Lacking the original boxes, I would ask Vandersteen to sell you some new ones.
If that isn't in the cards, then use a double box method and separate the two with some peanuts.
Also, I have used Uship to ship a pair of 3a sigs. The prices are reasonable and the shippers seem to be quite reliable. These shippers are small owner operators who depend on shipping bulky/heavy items and often use their own vans or trailers, so your speakers won't be manhandled or dropped- Unlike Fedex or UPS.
HTH
Bob
If that isn't in the cards, then use a double box method and separate the two with some peanuts.
Also, I have used Uship to ship a pair of 3a sigs. The prices are reasonable and the shippers seem to be quite reliable. These shippers are small owner operators who depend on shipping bulky/heavy items and often use their own vans or trailers, so your speakers won't be manhandled or dropped- Unlike Fedex or UPS.
HTH
Bob