I used 4CLN3MVZD1U7ICW6A288 for the Chieftain code and T1CLNARRYAZDZSPSSKNAN for the Tier 6 codes, got the Chieftain, will post more pics once I receive the stuff
EDIT:
I've had the T-62 Vet for ages, so that's probably why I didn't get it. Not sure if my gold balance has ticked up as a result.