Itachi did find the weapons but he equipped Susanoo with the two weapons. If Itachi transferred Susanoo to Sasuke then I imagine that Sasuke would also have the weapons, seeing as he has Itachi's MS (until proven otherwise)susanoo is a ability that awake with the ms, the mythical weapons were something he found. Oro had been looking for the sword so it is not something u get when u get ms. itachi just added these to susanoo to make it better, he may have only gotten the sword to deal with oro.
I doubt we'll ever see Sasuke use it though, he'll probably rely on his EMS techniques/his own MS techniques.










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