[Event] Returning Adventurer Box I

- Description: Right-click to obtain: Black Stone x6, Horse Emblem: Beginner's Maroon Horse, [Event] Giant Employment Contract Box, [Event] Goblin Employment Contract Box, [Event] Human Employment Contract Box, [Event] Extra Combat EXP Scroll x3, [Event] Extra Skill EXP Scroll x3, [Event] Extra Life EXP Scroll x3

- Additional use requirements are not yet decoded; this is not a complete eligibility check.