On a different note, and to play Devil's advocate, is it possible that Jorg said or meant to say that the box would allow two 4 Ohm cabs to be run with a 4 Ohm amp (most likely series wiring for an 8 Ohm load), not necessarily at a 4 Ohm load? I don't have a personal stake in this and don't know, obviously - just trying to keep an open mind before drawing conclusions.
As far as a "box", I was under the impression that the OP had received one and had not been able to plug it in, likely due to an NL-2/NL-4 mismatch between jack and cable. (Though I don't know that, either, and if there's doubt about the safety or resulting load, probably best not to hook it up until those doubts are cleared.)
Here's hoping, meanwhile, that things get cleared up and work out as well as possible for all parties involved.