A due diligence checklist -- the starting point for a calibrated taxing system for antiquities or for a registration system

Matthew Bogdanos and Amr al-Azm provide a helpful list of due diligence red flag indicators for insurers, dealers, auction houses and collectors handling antiquities. 

This is an excellent starting point for a checklist that could be used for a registration system for antiquities and/or as the basis for assessing the tax rate for a given artifact (the more red flags, the higher the tax) under a Pigovian (corrective) tax system. I have laid out the Pigovian tax idea here.