Welcome to Fuji. Which Fuji camera you got ? And from which Nikon camera ? I used to be a Nikon user myself. From how you sound, I think you were using Nikon dslr? Let me guess, D5600 ?
  I bought my XT1 used, it has MCMC sticker. OTOH, I bought my XT3 brand new, but it was import set, so no MCMC sticker. So, my guess is, if no mcmc sticker on the body, very high chances that it's an import set.

Got a xt4, but there is this paper inside the box.

Seller claim its MY Set, but no MCMC sticker, so i guess anything happen , i just claim from them la, since got conversation all.

BTW, iszit true this fujifilm e warranty website always got problem? like cant register for warranty?

I see. Since you are given the option to register your camera on fuji website, then I think it should be fuji malaysia set. Instead of wondering e warranty website always got problems, why don't you go ahead and register it and see if that's true or not? Unless you want to deliberately put that on hold to extend your warranty period.....  
    I've sent two lenses to them last year around January. Their services was relatively fast (2 months both ways), but now I heard it's getting worse.

If the price is the same, of course I go for Fuji MY set, because you get free service for manufacturing defects. But since the price of import sets are usually much cheaper, I never hesitate to go for import set if the options are available. So far, I almost never get manufacturing defects with the cameras and lenses I've purchased since 2016 from my sony days. But then again, even if I do, I can go always back to the seller, because even import set has warranty, just that you need to go back to the seller instead of fuji malaysia.
Woh, from FF to Apsc.  I was once a 4/3 user (olympus e-300). Ever since I came to apsc I don't think I can ever go back to the smaller sensor. What makes u want to "downgrade" to apsc ?