The omron hem-8712 box was not sealed. Box was opened to put the add on adapor inside. All the item inside was not sealed. If you choose large cuff add on, seller will take your original cuff and sell in his own shop.

Did you read the Omron link I put here? Read again below:
What happened to the products purchased from an unauthorised retailer?

They may be defective, damaged, counterfeit products, knock-offs, stolen goods, or products obtained through secondary market channels. Omron cannot guarantee the quality or effectiveness of such products and as such, they are not covered by Omron’s Warranty Policy in Malaysia.
Seller claim item is 100% ORIGINAL from Omron.

Seller didnt mention this is seller warranty or whatever. This already violate the rules as they say this unit is 100% original. If original, where can I register the warranty??? I cant even find the product registration section in Omron JP website after using google Translate.

from where u get the hint of saying the seller is "authorised" again ?

hes very sad d, no need to push him.