Second time going through the caves, there are 4 darknuts. A fun fight. The easy way to defeat a darknut, is: get close to him. once he slases, do a back flip to dodge the attack. Now do a jump attack. Then slash 3-4 times. Repeat until he has no more armour. once he has no armour, do the roll attack, where you side jump, roll, then slash. This knocks him off balance. Start slashing. Repeat process till he dies. I killed the 4 nuts, losing only 3 hearts.
The post man, who at the end of the second time through, says "I think you're lost. It's got to be here somewhere.", he is reffering to the triforce, thinking you're after itm and are lost. He himself is looking for it, the paper him holding possibly being a ma to it.