Isn't this the same one that's part of the regalia of the Iron Ring? And AFAIK by 1615 all the plot-tokens - sorry, artifacts! - had been gathered. Who's got the Sword *position* in 1620 is left undefined according to OiD, but it's there. Location known, to the Ring at least.
Of course, that could mean that they've asked some Asrelia priestess to look after it for them!
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