now ori Malaysia set only have 3g dual sim model. 4g dual sim version will be released through telcos sooner or later
there are 4 different variants all together, 3g single sim, 3g dual sim, 4g single sim & 4g dual sim. All 4 variants are identical. The only way to differentiate is read from the packaging box or put in sim card to test.

I saw one forumer selling around 700 something, not sure is ori or ap set

update: Directd is selling at 769 ori set

if it is ori then it should have avaxx or zitron stickers.
You can claim warranty from Microsoft Malaysia if it is ori set, include those ori set you buy from reseller

as per link