Every paper filed must be printed in black ink on 8.5 × 11-inch opaque white paper and begin with a caption that includes:
(a) The parties' names,
(b) A title that describes the paper's purpose, and
(c) The docket number assigned by the Office of Administrative Law Judges. If the Office has not assigned a docket number, the paper must bear the case number assigned by the Department of Labor agency where the matter originated. If the case number is an individual's Social Security number then only the last four digits may be used. See § 18.31(a)(1).