NYS estate tax guidance about reporting requirements for certain estates

Under section  20.2010-2T(a)(7)(ii), if the federal return is being filed only for the purpose of electing portability, the estate does not have to report the value of property qualifying for the marital deduction or charitable deduction.  Instead, the value of the gross estate must be estimated based on a good faith determination, and the property must be listed on the applicable schedules for the
federal estate tax return (Form 706).

http://www.tax.ny.gov/pdf/memos/estate_&_gift/m12_4m.pdf