There is some info there that says that Ishy/Moridin, as adviser to Hawkwing, gave Hawkwing's son an "unspoiled" copy of the prophecies as a parting gift at the docks when the ships were about to leave.

The book Moridin gave to Hawkwing's son became the Seanchan book of prophecies.

There is a place in PoD where the Seanchan general thinks to himself that the "westlad's" prophecies were corrupted just as the Seanchan's had been before Hawkwing brought them the pure copy. That's actually twisted logic and impossible if the guy though clearly, but you can't expect too much sometimes.