Take Borak's Lockbox to Oronok Torn-heart at Oronok's Farm in Shadowmoon Valley.
Take this box to my father. He still resides at Oronok's Farm, far to the north, above Coilskar Cistern. When all three fragments are pieced together, the ancient words will be known once more.
Good luck, [player]. Tell my father that I will be home soon.