Question about Tamron AF 17-28mm F/2.8 Di III RXD

I wanted to register the lens I bought yesterday with Tamron CH. But I can't because the security sticker on the box is missing. Apparently this lens was not officially imported and it is a grey import. In my opinion, a corresponding note on the product would be mandatory. After all, it makes a difference whether you have a 2 or 10-year guarantee.