I did not open the gift box since few days ago, but looking at the other posts by other users, it seems that the change he tried to say is about the challenge. Previous post by coin_trader, the challenge is about to receive 50% deposit back while his challenge as shown in above SS is 20% deposit back. I'm not sure if users can get different challenge, if the challenge is the same for all users then we can say that there is indeed a change from 50% to 20%. However, if it is possible that challenge can be different between users (maybe because of the time of opening the box), then we cant say there is change.