Interestingly, I had asked the community what they would do about it when it hit my in-box: Gold mailed to me from stranger - what would you do?
It seems half the community would have kept it; half would have contacted the sender. I did the rare thing and went to Blizzard. I suppose I should go update the thread and see what the community thinks if this was properly handled.
Thanks for your feedback. I guess we just have a complete difference of opinion on this.