I was very nervous getting a second hand MacBook but trusted that it was coming from Amazon and not a third party seller. Setup was a bit of a pain because you have to “trick” it when accepting the terms. I discovered that by not using my Apple ID I was able to click “accept”. Then I signed into my account after I finished  the rest of the initial setup and all my iCloud stuff was there. Anyway, this thing looks and runs like brand new, I updated to the latest iOS and I might as well have a brand new MacBook for pennies on the dollar. Super happy!