What Am I Riddles

Question: A man travels by wagon,
brings joy each evening,
but depression by the morning.

Who is he?

Question: We have what we did not find; what we did find we left behind.

[What do we have?]

Question: Occurring once in a hundred years and once in thousands. But never in a day or a year or a century.

Question: Name two different words using following words only... 1. Without me 60% living beinga cant survive.. 2. Without me none ( living+non-living cant survive... 3. Both have five letters each but both r anagrams of each other..

Question: A box without hinges, key or lid, yet inside, gold treasure is hid. What am I?