Interesting. I just checked my 1 german wwii model plane, a 1/48 Tamiya fw190 a3 and there are no swastikas on the box art or pictures. The decal instructions show a white diamond on the tail with the decal number that corresponds to the swastika on the decal sheet. I suppose that allows tamiya to abide by certain countries rules but provide an accurate kit markings for other countries
Correction: I have a /48 special hobby flettner fi 265 and they take it a step further as the decal sheet has deconstructed swastikas.