Got my Warthog Code for FH3, redeemed it, but it got uninstalled with the demo and I can't ...

I have the same issue. I redeemed the code & the Warthog showed in the FH3 pre-order & also in the demo. I uninstalled the demo & the Warthog was removed from the full game installation.

It is not showing up under ready to install for the full game, my code no longer works due to being redeemed, & the Warthog gift car doesn't show up in my purchase history online, although I still have the message in my XBOX Live message history.

I'm having the same problem. The Warthog was a 10MB file titled "Gift Car Halo Warthog".

I pre-ordered the Ultimate Edition bundle with early access on Sept23 and installed the pre-order download. I then redeemed my code from the message which is still in my XBL messages and the 10MB Gift Car Halo Warthog file appeared in my FH3 manage game
files. Then I downloaded the FH3 Demo and played it, the warthog file simultaneously appeared in my manage game files for the demo and the full game pre-order dowload. I then uninstalled the demo and the warthog file was no longer listed under manage game
for the full game pre-order download. I uninstalled the full game and restarted my console and reinstalled the full game pre-order download and the warthog file is not listed under manage game or ready to install. I then reinstalled the demo and the warthog
file doesn't appear under manage game or ready to install for the demo or the full game pre order download. I checked my purchase history and the warthog code redeem does not appear there. I as well suspect that the issue is that the full game has not yet
launched which is scheduled for Sept27. If the warthog file appears for me upon the start of early access Sept23 I'll try to give an update if this issue is still open. If it does not appear I will wait until Sept27 to give an update.

For some reason alot of the Warthogs did not show up in game no matter if you had the early release of FH3 from Friday the 23rd or Tuesday the 27th.... alot have just started showing up randomly, I got the early release of FH3 and I redeemed my Warthog
code when it was first sent out, my Warthog did not show up in my gifts section until late Tuesday nite...

I have same issue downloaded the warthog, played the demo, warthog gone and not showing in my ready to install list in fh3 manage game. Tried using the code again but no luck

I played Halo MCC at least once a week for the last 3 weeks and got FH3 Friday, never got a warthog code?!?