Geez.... Now thats some confidence in your product. Actually. I think thats a great Idea. They all need to come that way from now on.
I could have used that.
Somehow I suspect that what you got was destin to be an advance replacement for someone who had a dead esc and they sent out the new one and a envelpoe to mail the dead one back in.
Since this was a "free" controller it probably went through some odd channel to get processed at CC.