I don't believe you can. Once you create a custom unlock, you cannot fly outside of it, once inside of it. The rest of the world outside the custom unlock becomes an NFZ. That's why custom unlocks should be avoided wherever possible.
However...
I did sell one of my KR's. If he claimed this I would ask the same that I am asking anyone here. Prove it, show me evidence it is not in FCC. So far nothing, all speculation and hearsay. I am fortunate to have one from Japan and can compare the...
The sticker clearly indicates the contents in the box have something different than every other M4P. Despite the boxes all being identical, the sticker is a good way to indicate the difference from an inventory or logistical perspective...