I had just finished the first mission before the latest patch in the venom campaign and after the patch the rewards changed. It now says that I received a yellow amazing bag man cover and that is not true. I now am missing that cover with no other easy way to get it. Please help!
I’ve noticed this too - with the new patch, there are a couple of covers that the game says I have won, but I didn’t receive them because I completed the mission pre-patch. I can’t see any way (other than spending lots of HP on a small chance) to get these covers 
This is being discussed here (Changed rewards broken - MPQ General Discussion - 505 Go! Official Forums), too just FYI. 