The problem is that it gets easier and easier to track everything.
In the future maybe each pack of paper will have a steganographic tracking code - slight white variations for example, so you could track the paper to the selling shop.
The camera, the scanner could also do this.
And as more and more systems get integrated, they could see that your car and your phone were present at the time in the shop where the paper was sold.
A second hand printer can still be tracked if you buy it through craig list, even through a long chain - the original printer was sold in a shop, the CCTV and facial recognition and phone location identified the original buyer, the buyer Craiglist account sold such a printer second hand on some date, he was tracked to some location, you were also tracked to same location at same time, you were pictured carrying a big package, your high-resolution electricity metering suddenly shows that you have a laser printer running in your house, and that you printed exactly 53 pages on the day of the leak, ...
As you can see, it will become harder and harder to do anything anonymously.
CSI will look naive compared to what will be possible in the future. Infinite zoom and camera viewpoint rotation will be trivial if you'll have one little camera in every door, every street sign, every corner, every car, every little thing.