I am betting the reason Tamyia re-boxes Italieri kits is for sale in Japan proper. There are import tariffs that could make the Italieri kits unsellable in Japan because of the price. If Tamyia imports them and sells them as Tamyia, the taxes are less. Italieri gets the increased sales, Tamyia gets increased sales and doesn't have to do the work to make a kit of that subject. What is a little confusing to me is why they would end up in the U.S. competing with each other.
John