At these prices.. They're probably grey market, so whatever issues are handled thru the seller and not Samsung. For me personally it's not a massive deal cos I buy watches on grey market already.
If it's an issue for you, don't do it. It will be fun and cheaper.. But if you're expecting some easy service or something, you'll get frustrated.
So far I've had no issues with the phone. Received the recent update, everything works as intended. I'm quite happy with it. Not sure what else is needed to 'verify' stuff on here but, it's great.
Enjoy the rest of the week people