39 CFR 965.5: Initial submissions by parties.

Within 15 days after receipt of the Recorder's notice, each party shall file via the Judicial Officer electronic filing system (https://usps-judicialoffice.journaltech.com) a sworn statement of the facts supporting its claim to receipt of the mail together with a copy of each document on which it relies in making such claim, and any arguments supporting its claim. Unless the presiding officer otherwise permits, all documents relative to this proceeding must be filed using the electronic filing system.