Answer:
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
What can be big, white, dirty and wicked?
What has 4 legs in the morning, 2 legs in the evening and 3 legs in the night?
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
What goes through a door but never goes in. And never comes out?
My days are numbered. What am I?