Hey. While I am no expert on these matters, I hope I can share some of the answers I had for similar questions.
I ordered my game instore. I went in last week and recieved my OB card from the clerk. He told me that I would recieve the "code" for my pre-order incentives in the game box. Apparently the incentives aren't usable in the OB.
If you ordered online, apparently they are supposed to e-mail you said codes.
Then call them about it. You should have gotten a code from them.
Did that and still no signal. Now seeking here for what is going on. Receiving open beta key in time would had suggest that I would also receive my head-start key in time. This does not look good and wonder what actions are taken to pro-actively resolve the situation.