Success getting Gil restored that was removed by a compromised account?

[Berkilak]

That said, if your scenario is different than the one described above and the person whose account was compromised was also the one who withdrew the gil from the FC chest, I'd say that you might have a better chance at it -- since those transactions would be, presumably, preserved in the logs associated with the incident. In that case, I might keep trying on ticket submission.

It was indeed the compromised (and subsequently restored) character that removed the gil. The withdrawal is still visible in the in-game chest activity log, and I took a screenshot just to preserve it. Here's hoping!