A box

There is a day in the summer,
I walk in random and I saw a box staying at the corner.
This box is so familiar to me.
It was an old box and stay at the corner quite some time.
But the weird thing is that it got no dust at all.
I wonder what in this box.
I walk toward the box and lift it up.
Suddenly a flash of memory just playing in my mind like movie.
This is a box that I thought I dumped it quite some time already.
But why now it appears in that corner?
I knew what inside the box.
I got no courage to open the box.
I know it will cost me a lot of things if I open it.
So now come to the place which I need to decide.
Dump it? Or open it?