What should I do if I have not received information from my tax audit?

You should talk to your CPA who should have handled the audit for you. You should not handle an IRS audit by yourself. What would I do if it were me? Since I know that I pay all of my taxes and do not take inappropriate deductions, I would contact the auditor and find out what the result was. Personally I would not let sleeping dogs lie. The IRS may claim it sent you a notice. If you did not receive it then there may be interest running. I can assure you that others would advise you differently, that if you are absolutely certain that did you did not receive a notice, do not contact the IRS because the statute of limitations on the IRS may now have passed, or will pass before the IRS figures it out. They would advise you that because they are not sure that you pay all of your taxes and have not taken inappropriate deductions.