Used D810 (HK) - SG or HK set?

I am on look out for used D810 and see a few of them having label in box as D810 (HK).
Most owners say they purchased from SG itself under Nikon warranty, but why the country code is then HK and not SG?
My D750 is labelled D750(SG) in the white sticker of Golden box. But was it D810(HK) for local sets in SG?

daredevil123 said:

At one point in time, Nikon HK was the regional HQ. That has changed a couple of years back and the HQ has moved to SG. When D810 was launched the regional HQ was still HK and many camera bodies even though local set shows Nikon HK. When D750 was launched the regional HQ already moved to SG.

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Thanks a lot for the clarification!