The real danger is not knowing there are missing codes, as the supplier can quite rightly say that the aircraft and software are exactly the same, the full potential is only released by using the right codes.
As long as someone in the purchasing country can verify that the source code doesn't contain such easter eggs then there should be no problem, but if its a black box with a "you gotta trust us" sticker across it then theres a big problem.
Cheers