Hi Satoshi!
My information comes from only the synop buffer files marked "ISMC01 VDPP", which are distributed by Cambodia.
Based on this, I confirm that:
the given coordinates point to the country of Myanmar.
the given names are not the same as the stations in Cambodia in Oscar, but to the settlements in Myanmar.
Myanmar did not register these stations in Oscar, they are listed in the wrong place in WDQMS.
It seems that Cambodia distributes the Myanmar stations, but they are not registered. So they do not have a WSI identifier either.
If it is as I think, then Myanmar should register the new stations, for example, as I have given ( 0-104-1-TAUNGUP or 0-104-1-48991), and encode the WSI into the buffer. I guess this would be too much of a task for them...
But I'm just guessing, I don't know for sure what the real situation is.
George from Budapest, HungaroMet