Apr 18, - I rented a storage unit and a few months later came back to find there is much damage inside from mice. They have ruined (chewed up) at least Can I sue my storage units for rat poop and uri. Jul 28, - John Matarese has a caution for anyone using a storage facility. of their belongings after much of what they own was ruined in a storage unit. one of the first things I saw and it was actually covered with mice droppings.".