Just some add information
Have learned following:
The retailer box (English) for both Lite-On LTD 163 - 163D and 165 are all the same, only telling that it contain a Lite-ON DVD 16 Smart X. You can't tell from the outside of the box which version is inside.
You simply have to open the box and read the sticker attached on the hardware inside. I got this information after contacting the official importer/dealer of Lite-On in Thailand.
And since then I have been having happy times running from one store to the other, demanding them to open all their boxes. Opening box no. 11 (in the 7'th shop I think), I finally found it, a nice LTD 165 = Region Free. Sometimes hard work does pay back.