Absent getting original boxes, I have moved SC-IV's with no issues doing the following. This operation takes two people. Get yourself a roll of shrink wrap and a couple rolls of soft open cell foam. Clean your speakers well and then shrink wrap them thoroughly. Next wrap them in the foam, cutting it in sheets large enough to go around them and then use painters tape to hold the foam in place. Just lap a piece or two over the top and bottom after wrapping the body. Try to get it tight as possible and mark the foam for front using a magic marker. Then shrink wrap the entire speaker again as tightly as possible and don't be shy about how tight you get the shrink wrap. Once you've done that and they are mummified in the foam and shrink wrap, the movers can box them up for you with very litle issue. I would still watch them box them and ensure they know to not use the from for lifting or leverage. It will be very tough to poke through the foam/shrink wrap, but not impossible, so better safe than sorry. Any reputable mover will be able to get it right after you do this, but insure them specifically anyway.