Should I use this car seat if it has been in a crash?

No — do not use this car seat if it has been involved in a crash; it must be replaced. Additionally, you should discontinue use of the car seat after the expiration date shown on the date of manufacture label, as hidden damage, lost instructions, or outdated technology can pose a risk. Do not use the car seat if it is damaged, broken, or missing parts. (Pages 16, 114)