They have not. Out of the clear blue one day around a month ago, I got an overnight Fedex delivery that I was not expecting. Showed the shipper to be Apple with me as the addressee. When I opened the box I was surprised to see an original iPhone in there.
I cannot tell you how many hours I spent on the phone with Apple, being transferred from one person to another, trying to figure out why they shipped me this iPhone.
In the meantime the phone wasn't locked and I went to email and found an email address. I then emailed the person from my desktop, asking if they were expecting an iPhone from Apple Care.
No one at Apple would tell me the owner of the phone, telling me that their record is not always up-to-date especially if the phone has been sold to someone else other than the original buyer.
Apple did send me a label and I shipped the phone back to them and gave me a contact name in case the owner of the iPhone were to answer my email.
Later in the day, I heard from the person I had emailed. He was sending the phone to Applecare for repair. He said they sent him the label addressed to me (remembered my name) but didn't question it thinking they knew what they were doing.
He thanked me over and over for sending the phone off to Apple and for giving him the contact name.