I've dyed my hair black, yeah, completely black.

and I got a card from the post office saying I have a registered mail, which I don't have time to get it yet, I wonder who sent me a registered mail... is it a letter? a package? a present? or a bomb?? who has my address and sent that to me? At first I thought it might be something that I'd bidded in auction but I didn't remember I want the item registered. what's that????