Who was the carrier who delivered it? I'm sure that will be somewhere on the address label or if you go into your orders on Amazon, the name of the delivery firm may possibly be on there. Contact them and tell them what has happened, and that they must know that you refused the wrongly delivered parcel in the first place so it should not have been redelivered and would they please come and pick it up.
If you get nowhere with that, can you cuit or tear the box down the sides, or pull off any sticky tape holdng it together, so that you can lay it flat. The rain may get it softer to tear up! Then it can be put out alongside your recycling bin.