My DS is 3.5 we bought his first car seat 4 years ago, a maxi cosi cabriofix. It has been stored in our attic with the seat covers stored in a plastic box, since we stopped using it. Would you reuse for No.2? I know its never been in an accident and it should be within expiry date as we purchased 4 years ago. I'm just feeling guilty as this baby doesn't seem to be having much new.