One Piece Chapter 12, page 7: Chapter 12: DOG

Luffy is delighted to see Nami, shouting, 'Hey! It's our navigator!' Nami quickly retorts, 'I never agreed to that! I just wanted to thank you for saving me...' Zoro, still lying on the ground, mutters, 'Thank us?' Nami then tosses a key onto the ground with a 'TINK'. Luffy gasps in realization, 'The key!!!' Zoro sits up, amazed: 'You stole the key to the cage!' Luffy laughs joyfully, 'This is great! I thought I'd never get out of here!' Zoro smiles, saying, 'Then the rescue... was a success... after all!' Nami sighs, 'Hmph. Yeah, sure... I got the stupid key, but I left the map and all the treasure.'