In an action in rem, a claim shall be verified on oath or solemn affirmation, and shall state the interest in the property by virtue of which the claimant demands its restitution and the right to defend the action.  If the claim is made on behalf of the person entitled to possession by an agent, bailee, or attorney, it shall state that he is duly authorized to make the claim.[i]

The claim shall describe with reasonable particularity the property that is the subject of the action and state that it is within the district or will be during the pendency of the action.  In actions for the enforcement of forfeitures for violation of any statute of the United States, the complaint shall state the place of seizure and whether it was on land or on navigable waters.  It shall contain such allegations as may be required by the statute pursuant to which the action is brought.[ii]

[i] Frontier Acceptance Corp. v. United Freight Forwarding Co., 286 F. Supp. 367 (D.N.J. 1968)

[ii] Merchants Nat’l Bank v. Dredge General G. L. Gillespie, 663 F.2d 1338 (5th Cir. La. 1981)