Holy shit, I was actually there for the end of this! He wasn't sure how to get to the Seb entrance, and was understandably worried about finding it without ITU. I found him at the wall nearby, gave him ITU and escorted him
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Can confirm, if nothing else, that Octopath definitely was delivering a weapon to someone at Seb, and also that he was very nice.
I didn't know he was noteworthy for a post on the forum, now I need to do a search
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EDIT: I searched, I expected some big drama or something. He's the guy that lost a lot of money by accidentally handing it to a guard.