To report back on my refurbished lens: the 600 TC arrived in a plain brown box, loosely taped, with not one but two disclaimers on the outside saying it was a refurbished product with a 90 day warranty. Inside was the lens bag wrapped in bubble wrap. The lens bag looks new. Inside the bag, the lens was wrapped in plastic. The lens itself also looked new--I could not find any blemishes. The strap did not appear to have ever been removed from its plastic wrap. There is one, very hard to see, tiny hole, or dot, after the serial number. The lens performed as expected in the backyard. It does appear Nikon is trying to make a statement with the way the outer box appears, along with not including a gold box.
It occurs to me that if someone returned a lens for repair, Nikon would normally repair it and send that same lens back to the customer. In what circumstance would Nikon send the customer a new lens, but then repair the old lens and sell it as refurbished? Maybe if the needed parts weren't available? Someone posted that most of these lenses are demos or loaners and that makes more sense to me. I guess they trash the gold boxes to make sure you know its refurbished.