Credits DO NOT transfer from season to season.
More information about what was and what wasn't transferred from season 8 to season 9 you can read here:
https://www.ea.com/games/nba-live/nba-live-mobile/amp/news/nba-live-mobile-season-9
The credits aren't mentioned on neither section of what you WILL and WILL NOT keep. If that is the case and they do not roll over, they should list daily credits in the "YOU WILL NOT KEEP" list. Anyways, that doesn't explain why about 1200 of my players cards disappeared. The item limit is supposed to be 3500.
