1.   Large art museums throughout the world, sensitized in recent decades to the problem of looted artifacts, generally do not knowingly accept them.

2.   Nations rich in antiquities were urged to stop lending to museums that continue to acquire looted artifacts.

3.   Ordinarily, looted artifacts are exceedingly difficult to track.

4.   Mexican archaeologists say the U.S. and Mexican governments have cracked down on smuggling of looted artifacts, but trafficking continues.

5.   The case is part of a U.S. crackdown on trafficking in looted Latin American archaeological artifacts within its borders.