ROY LANGBORD v. UNITED STATES DEPARTMENT OF THE TREASURY
PNG arguing that U.S. Government can't seize coins merely because the coins were never issued as U.S. legal tender.

ANCIENT COIN COLLECTORS GUILD v. U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT OF HOMELAND SECURITY; COMMISSIONER, U.S. CUSTOMS AND BORDER PROTECTION; UNITED STATES DEPARTMENT OF STATE; ASSISTANT SECRETARY OF STATE, EDUCATIONAL AND CULTURAL AFFAIRS
PNG arguing that federal law requires foreign countries claiming coins as cultural property must prove that coins were "found" within their national borders.