Kappy and Babowa, thank you for your replies. I purchased it from Amazon. Seller name is "6ave". I have not received it yet, should be here in next few days. I was trying to get ahead of the game by buying the extended Apple Care before it arrives. Now, I'm not sure if I should even open up the box, in case I need to return it.
1. Seller's listing says: "(Certified Refurbished)" at the end of the listing title.
2. Actual description says: "27-inch Recertified. Apple MK482LL/A Apple Certified Pre-Owned units are fully tested and certified by Apple to look and work like new. All Certified Pre-owned units come with a full one-year Apple warranty and can be repaired online or via any Apple store across the nation. In addition, all units are eligible for AppleCare add-on protection directly via Apple if you want to extend the product's warranty period. The certification process includes functionality testing, basic cleaning, inspection, and re-packaging. Only sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com." This last sentence is interesting - maybe Apple does allow some of their Certified Refurbished products to sold elsewhere?? I see them all the time (there aren't too many, but I do see them, like one or two every time I look on Amazon and e-Bay (I've been shopping the iMac desktop for several months).
There is also a statement above the "Warranty & Support" paragraph that says: "Date First Available: December 25, 2016", From your response, this unit is apparently not from the mid to late 2017 period, and perhaps the one year Apple warranty has run out. However, this may be the manufacturing date, and the unit may have been sold NEW sometime in mid to late 2017.
If I can get the serial number for it, I should be able to find out when it was first sold and when the Apple warranty expired(s).
Why would the seller say that it has a "full one-year Apple warranty"? If what you are saying is correct, and I believe it is, then the unit should only have part of a one-year warranty left on it, unless pre-owned units that have been certified by Apple come with a full one-year warranty??
Any additional comments will be much appreciated.