Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3742.3–4 Proof of publication

After the period of newspaper publication has expired, the person requesting publication shall obtain from the office of the newspaper of publication, a sworn statement   1 that the notice was published at the time and in accordance with the requirements under these regulations of this part, and shall file such sworn statement in the office where the Request for Publication was filed.

 18 U.S.C. 1001 makes it a crime for any person knowingly and willfully to make to any department or agency of the United States any false, fictitious or fraudulent statements or representations as to any matter within its jurisdiction.