This, my mom had an accident with DS that didn't have any the things listed. So the insurance company refused to replace the seat. However when DS had a simlar accident our insurance company replaced the seat even though technically it didn't need to be.
Re: I had no idea you could not use a carseat after being in an accident
Here is more info, too, on whether you can actually use the seat (depends on the type of crash):
https://www.britaxusa.com/customer-service/faq/after-a-crash
This, my mom had an accident with DS that didn't have any the things listed. So the insurance company refused to replace the seat. However when DS had a simlar accident our insurance company replaced the seat even though technically it didn't need to be.