I placed an order at Overstock last week for a Christmas present for my mother. Said package arrived today. When I opened the package, in addition to what I ordered was a CD called Grey's Anatomy Original Soundtrack Volume 2. I did not order this CD, so I was upset that I'd have to return it and that I was charged for something I didn't order. So, I checked the invoice, which only included what I did order. I then checked the Email they sent and the orders online. There is no record of their ever sending this to me. I don't want to go through all the trouble to send it back. (And think about the shipping I'd have to pay for their mistake.) So, my questions are these:

A. What is the right thing to do?

B. What do you think I'm going to do?

And C. Given the situation, what would you do?