Patel v. Mukasey, 526 F.3d 800, ___ (5th Cir. Apr. 29, 2008) (the elements of the federal offense of misprision of a felony, in violation of 18 U.S.C. 4, were described as "(1) knowledge that a felony was committed; (2) failure to notify the authorities of the felony; and (3) an affirmative step to conceal the felony. See United States v. Adams, 961 F.2d 505, 508 (5th Cir.1992). "[U]nder the misprision statute, the defendant must commit an affirmative act to prevent discovery of the earlier felony." Id. "Mere failure to make known does not suffice." Id. at 508-09 (citation omitted). It is irrelevant whether at the time of concealment the Government had knowledge of either the crime or the identity of the perpetrator. Lancey v. United States, 356 F.2d 407, 409 (9th Cir.1966).").