Missing your Hellfighter DLC? Chances are that you simply didn't notice it! See below for more information:
Please note that there are TWO CD keys in Autokey.
One is an image key, and the other is a TEXT key. The text key can be hard to notice against the large size of the scanned image key. If you look closely, just beneath the image CD Key, you will see a second CD Key which is in 'text' format, allowing you to copy and paste the CD Key into Origin. That's your Hellfighter DLC!
See you on the battlefield!