Sorry if this has been asked before. How come the Japanese versions of Earthrise Deluxes/Voyagers don't come with the red decoder strip?

I just got an Earthrise Arcee and Earthrise Megatron from Japan and the instructions have a big black sticker over the diagram of the hand holding the decoder on the last page (you can tell by holding it to the light). Also the packaging box doesn't contain a red decoder (either stuck to the plastic shell or to the galaxy map). I don't need the decoder (got lots) but I thought it was a curious difference. The Chinese versions have the decoder and decoder how-to instruction.