I think on the other forum Jerry confirmed these will have separate boxes, you just get the same edition number on both since they're an Exclusive set. But he said a single box would be too big.
The largest single box I have for a statue is Thing PF and I never want any statue box that size again. It's a big dumb cube box (I don't think the packaging was designed well for that at all since Rhino is comparable in size to Thing but Rhino's taller, slimmer box is more manageable). It could be a piece of furniture.
Two boxes for this should work well.
Abomination's box barely fit through my front door