Separation anxiety

Ryan got a bit upset while I was at work yesterday and scratched up the floormat at the front door. He also knocked a squishy ball and a small notepad off the counter near the garage door and chewed up the paper of the notebook. He opened the pantry, but he didn't mess with anything on the floor in there. I decided to bring in the big crate and set it up in my bedroom. I had to run an errand and threw a towel in there for him to lay on and put him in there. When I was back in 20-30 minutes, the towel was shredded. So, no towels/blankets in the crate. It is a total opposite of how he is at the shelter where he wants to get into his crate and hides in the back.