I think I have the same problem. I've purchased the game through the demo version, but it never game me a key. Underneath the blue "Finish" button on the Findmyorder page, it says this:
Click on the begin download button to download your product.
Serial Number: None
Subscription Key/Unlock Code: None
There is no download button either. Not that I need it because the game is essentially already on my computer. I just can't unlock it even though I just paid for it.
Hmmm... I'm going to try those red "Customer service" words at the top of the Bone startup screen and see about getting my key re-issued. That's the only thing I can think of that might solve this. But I really don't know why it didn't give me a key to start out with.