The date we reverted the DLC text to the correct percentages on IP/XP boosters was the evening of June 14th, that's fourteenth, 2016 (USA time). So I'm going to reimburse anyone who has a date of June 15th, that's fifteenth, or earlier. A day of grace period sounds good to me.
Also, I now have a way to give everyone the boosters without doing 20-40 individual forms to fill out per user. That would have been a nightmare, so a big thanks goes out to Yodo1 for giving me an easier time with that.
I'll edit the original post now.