The 5 digit self-selected PIN used to e-file the tax return is not the same as a 6 digit Identity Protection PIN issued each year by the IRS.
If ID theft concerns you, then you should request an IP PIN from the IRS for yourself, spouse and children. If you do then you will have to use the IP PIN's on every tax return you will ever file with the IRS.
Go to this IRS website for an IP PIN - https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin
