From Gamer Escape's FFXIV Wiki, the free Final Fantasy XIV encyclopedia
The Calamity Salvager allows for the repurchase of certain previously obtained items that you may have discarded. As such, items available for purchase will vary depending on conditions met by the player.
Are you here to claim your belongings?
Players from version 1.XX can speak to this NPC in order to retrieve any extra items that had to be moved as a result of decreasing inventory space for 2.0. They can also trade in Cracked Materia and gear with Cracked Materia to restore it, as well as parts of seasonal event items for the complete version. Unique armor and weapons that can only be obtained once can also be repurchased here, such as the Meteor Survivor Ring or blue weapons/tools obtained from lvl 50 class/job quests. Sells the Major City unique rings that a character will start the game with.