Forza horizon pre order bonus

[LowlyAssassin]

start again
excerpt from several sources
If you pre-order Forza Horizon at a participating retailer, you’ll immediately receive a special code you can use to download a 2012 Dodge Challenger SRT8 392 in Forza Motorsport 4, complete with a custom Forza Horizon livery created by the Forza community team

I walked into game and pre ordered forza horizon to get the code for a the srt8 in forza 4
and just checked my receipt and can't see any special Xbox 25 digit code or instructions
with forza 4 I had to email a copy of my receipt with gamertag to turn 10 but this time its a special code
so do I just walk back to game and go hey bizatch where's my code ><