The way the lobbyists for the dealers in such a specific commodity as dug up antiquities drag out the same time-worn arguments to justify lack of responsibility is pretty wearing. Here is Bailey and Ehrenberg's Peter Tompa again dodging the question on the thread of Abu Sayyaf II on the Chasing Aphrodite blog.
Paul Barford
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Peter Tompa
[...] Best advice. Buy from trusted sources. Buying from dealers who are members of trade associations with ethics rules good idea for collectors. Dealers need to assess the source of their own purchases. Levels of due dilligence will depend on the source. Obviously, buying from a collector you have known for decades different than buying from someone you don’t personally know. It will depend on the facts and circumstances of the individual transaction.