Bonhams and the Medici Statue: Lot Withdrawn

During the afternoon this statement has appeared against Lot 137:

Lot No: 137W

This lot has been withdrawn

A Roman marble figure of a youth  

Circa 1st-2nd Century A.D.

This is the statue that features in the Medici dossier.

Will the statue be handed over to the Italian authorities? Why did the staff at Bonhams fail to spot that this was likely to have been handled by Medici?