If the papers are because you have been criminally charged, if you do not show up in court, the court may issue a warrant for your arrest.
If the papers are because you are being civilly sued by the other party for damages, if you do not respond, the other party may obtain a default judgment against you.
If the papers are for a civil lawsuit and you had insurance coverage at the time of the accident, you likely should contact your insurance company and give it the documents. There is only a short time to respond, you should not delay in forwarding the documents.
In any case, you likely should review your facts and options with an attorney.