Any person desiring to initiate a private contest must file a complaint in the proper land office (see § 1821.2-1 of chapter II of this title). The contestant must serve a copy of the complaint on the contestee not later than 30 days after filing the complaint and must file proof of such service, as required by § 4.422(c) , in the office where the complaint was filed within 30 days after service.
43 C.F.R. §4.450-3