Had 2 wins today (August 1), battle lasted more than 5 minutes and I had some attack points. The event page counted the win, but no gift box received? ?
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Update:
Had this 2 times now (August 3 too).
It seems that if your first winning battle goes from the last day to the next day (i.e. pass 12:00am server time), the event system counts the win, but will not give box for the win.