Got my copy yesterday and the dlc codes still worked :)
Expired. Code no longer valid
Mafia 3 back up to £11.95 now.
Thought I should add it only works out to be £6.93 if you use the 100 points you get for signing up :)
Sounds like you are having some great luck. It hard crashed on me a good bunch of times. Maybe it has seen a couple of patches since. I had a lot of funny glitches which are often welcome. I also sadly had some mission breaking bugs and that isn't welcome.