Answer:
A box without hinges, lock or key, yet golden treasure lies within.
What gets closer when you blink?
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
When I live I cry, If you don't kill me I'll die.
I have many feathers to help me fly. I have a body and head, but I'm not alive. It is your strength which determines how far I go. You can hold me in your hand, but I'm never thrown.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.