I called the Franchise Tax Board. They did not receive my tax return yet, but it may have been received in the other unit. They suggested: 1) Monitor whether the check gets cashed. They cash the checks as soon as they are received. 2) Call back a few days before April 15 to see if they rec'd it. If not, pay the amount due via a credit card so that we don't get fined penalties. Of course, I never heard back from the USPS about the certified mail failure.