The chest that you receive at the beginning of prologue when you get off the ship, can be received multiple times by restarting the game.
Steps to reproduce:
- Play until you get off the ship at the beginning of prologue
- Talk to Porter Mambo and receive a chest (I played summoner)
- Logout / close the game
- Restart the game, enter the world and you can talk to him to gain the same chest again.
Just reporting this so that you are aware and can check if this applies to other cases as well where its impact might be more significant.