You always have to be suspicious when the Italian Far Right is involved with something.
You could say Italy was the birthplace of fascism
Was the home of Propaganda Due, a shadowy right wing organization connected to terrorist organizations and dictatorships
The place where the Strategy of Tension happened, a series of false flag terrorist attacks meant to generate hatred of the Left
You have to be just as suspicious when Silvio Berlusconi appears on the scene, because he was a member of Propaganda Due.
We don't know everything there is to know about the Yellowcake Forgery, what we do know is that it was passed around a lot in Italy.
Details are sketchy, but the forgery did find itself in the hands of a reporter, Elizabetta Burba. Berlusconi's paper ordered her to give it to the US Embassy and then told her not to investigate where the forgery came from.
http://en.wikipedia.org/wiki/Yellowcake_forgery#Origin