11th Anniversary Hot Day: 5/11

Seems the list of rewards is slightly inaccurate.

The box actually contains:

• 2x EXP Coupon (x2): Untradeable, 7-day duration. Use to receive 2x EXP for 30 minutes.
  
• Selective 4 Slot Coupon: Untradeable, 7-day duration. Use to expand an inventory tab of your choice by 4 slots.
  
• Festival Badge: Untradeable, 30-day duration. Badge. Level 30. 10 Att/M.Att, 10 allstat, 200 HP/MP.
  
• 11th Anniversary Coin (x100): Untradeable.
  
• Spell Trace (x200)
  
• Saint Weapon Box: Untradeable, 7-day duration. Open to receive one random Maple Saint weapon.
  
• Character Slot Expansion Coupon: Untradeable, 7-day duration.
  
• Hair Color Coupon (VIP): Untradeable, 7-day duration.
  

Edit: ... and they've now updated the web notice to reflect the actual contents. Of course without marking it "[Updated]".