I am starting to think that Schwifty has messed up on this one. I missed Season 6 Weekly Challenges and was very upset with it. Today, I robbed the Plane (I was pretty excited since I rarely get to rob it bc of the tp glitches) and I earned 2500 XP for completing a “Challenge”. Now, dailies only give you 1000 and weekly challenges aren’t “available”, and when I checked my missions, “Rob Cargo Plane 5 times” wasn’t there. It was then “You unlocked Graffiti as a reward” popped up.
I think the veep is still obtainable.