When you turn the watch on, it should immediately show a screen asking you to bring an iPhone near it to start setup. If it asks for a passcode or shows a clock face, it’s still locked to the seller.
Look for deep scratches on the glass (which can affect water resistance) and check the "Digital Crown" (the side dial) to ensure it rotates smoothly and clicks. buying apple watch on craigslist
If a brand-new Ultra 2 is listed for $200, it is likely a scam or a high-quality clone. When you turn the watch on, it should