In view of the "taxpayer protections" afforded by the Internal Revenue Code (IRC), the RFPA does not apply to the IRS summons process. However, the IRC does not provide for a certification requirement; you may not condition delivery on receipt of a certification.
The summons must set out the time and even the place for delivery of the documents. Bank "policy" plays no role. Do not deliver them early. Do not deliver them late. Note the reference to criminal penalties for non compliance under Sec 7210 at the bottom of the form.
The taxpayer certainly has a right to challenge the summons; i.e. "bring a proceeding to quash," but that is not your concern.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.