After the next maintenance on May 18th, all Old Bora Rings in your inventory will automatically be switched with exchange item of the same upgrade value offered by the Event NPC, as previously annouced.
Any [Non-upgraded Old Bora Rings] and [All Old Bora Rings that is NOT in your inventory] (ex. Pocket, bank, guild bank, mailbox, market, and etc.) will be removed and they will NOT be compensated for.
So make sure to move and keep all your upgraded Old Bora Rings in your inventory.