Contact your auto insurance company that you had at that time and ask them to send a replacement of your original check.  If they refuse and claim that the statute of limitations has expired, tell them that the statute of limitations had not expired when the original settlement check was issued.There may have been a statement on the check stating that it would become void after a certain period of time elapsed if it had not been cashed.  If that is the case, you might be out of luck.