Inmate Filing. If an institution has a system designed for legal mail, an inmate confined there must use that system to receive the benefit of this item (iii). A document not filed electronically by an inmate confined in an institution is timely if it is deposited in the institution’s internal mailing system on or before the last day for filing and:
• it is accompanied by a declaration in compliance with 28 U.S.C. § 1746—or a notarized statement—setting out the date of deposit and stating that first-class postage is being prepaid; or by evidence (such as a postmark or date stamp) showing that the notice was so deposited and that postage was prepaid; or
• the appellate court exercises its discretion to permit the later filing of a declaration or notarized statement that satisfies this item (iii).