It appears that the Getty is facing further searching questions about the acquisition of amber objects derived from sites in Etruria and Northern Italy (Jason Felch, "Getty Museum review targets its antiquities collection", LA Times January 18, 2013). It seems that they were part of a scheme whereby antiquities were over-valued to obtain higher tax relief for donors. It is alleged that the amber pieces passed through a network that included Giacomo Medici, Fritz Bürki, Robert Hecht, and Bruce McNall. The ambers came through Gordon McLendon.
Felch lays out the issues in his usual clear way.
Online Getty catalogue of amber.