managed to get all of the possible responses to the Treasure Hunt reports that you can make and submit at the Naranja/Uva Academy website! Upon being shared to twitter/X, a randomly selected character will respond to your report, many of the characters bidding you a fun and safe journey to Kitakami. It seems like the opportunity to make your report will last 'til the 17th.
(very shoddily translated on google translate english versions are below the cut!)