The above reply was mine without logging in, sorry. I forgot how buried the Britax criteria is on the Britax website (in the FAQ section) and I can't figure out how to link directly to the list due to the frames Britax's website uses, so I thought it would be useful to post the text here:
"Britax recommends that use of a child restraint be discontinued if it has been in a severe crash. We further advise of the National Highway Traffic Safety Administration (NHTSA) position that it is not necessary to replace a child restraint after a minor crash. A minor crash is one that meets ALL of following criteria:
* The vehicle was able to be driven away from the crash site;
* The vehicle door nearest the child restraint was undamaged;
* There were no injuries to any of the vehicle occupants;
* The air bags (if present) did not deploy; AND
* There is no visible damage to the child restraint.
If your Britax child restraint has been involved in a severe crash, it may be eligible for consideration for a new one of the same or similar design. See the Voluntary Crashed Restraint Exchange section of our website for more details."
And here is a direct link to the Crashed Restraint Exchange section on Britax's website:
https://www.britaxusa.com/support.cfm?id=3958A81E-FBD4-433E-8CD2C1434381F74E
Again, hope this helps and hope you're feeling better.