Honestly, why do you think your cat is angry? Did you do something to cause him to be angry? Because cats don't get angry for no reason. They respond because of instinct or situations or environment. If you are projecting that because your cat is shredding paper and boxes etc that he is angry, he is simply playing. He lacks stimulation. Cat's hunt and they climb trees (outside that is thier instinct) they play with each other and they sleep and eat.
How much inside stimulation do you give this cat? Take one of those large boxes he is shredding and cut off the flaps, then cut some cat-size holes in the sides of the box (above the ground level) big enough he can jump in and out of and then throw in a few ping pong balls. Live by a beach? Take a walk after a storm and find a large piece of driftwood- bring it home, rinse it off outside, let it dry in the air, then brush it down and put it inside so he can climb all over it- look at ways to make his home life more interesting, clear out some of your closet and put in cat ramps, or buy a good cat condo.
Many cats shred paper. My Shredder that's how he got his name. He shredded mail, boxes, toilet paper, paper towels. He was never angry, he was happy. He was in his element. I used to take an old phone book and put it on the floor, sprinkle it with a bit of catnip within the pages, and let him have it, he shredded it in 5 minutes tops, then I put it on the burn pile and vacuumed the mess-
If your cat is shredding paper, it's no big deal, now if he is eating the paper and the cardboard, that's a worry. Also is he neutered? If not, he needs to be.