Talk:Hidden Demon Extermination in the Capital 2/@comment-35177215-20190130024134/@comment-29313470-20190130030058

It just means that if you have already completed a mission (for example, defeating 150 demon oodachis), but you did not manage to collect the reward (in this example, special background) from the missions page before the end of the event, the reward will be automatically sent to your inbox instead of being lost forever.

For missions that you have not completed, you will not be able to collect the rewards from the missions page, and the rewards will not be sent to your inbox after the event ends either.