The study estimates that 67,500-111,900 classical artifacts with inadequate provenance are being held by collectors or dealers. It would be very interesting to know what percentage is in the hands of dealers rather than collectors, and even more interesting to know how many total artifacts, well-provenanced as well as "orphaned", worth $1000 or more are now in private hands. One thing at least is deducible: the market for only inadequately provenanced Roman/Greek/related antiquities involves capital to the tune of at least $67,500,000-111,900,000 (since all the artifacts reported are supposedly worth at least $1000 each).
The CPRI could do a major service to all students of the antiquities markets if it could ascertain how many of these "orphans" change hands annually, at what prices, and in what country.
But the aim of the CPRI is not to throw light on the operations of the antiquities market. Rather, it is to call attention to the existence of these objects, which supposedly are endangered by being held in private hands:
objects excluded from acquisition by Member museums cannot have the benefit of professional museum exhibition, publication, or conservation. ... Such objects can have no permanent parentage or protection (many run the risk, over time, of deterioration, damage or destruction).
The problem with this line of argument is that even if the objects in question were not excluded from acquisition most of them would not be acquired. And the notion that dealers and collectors would be negligent towards objects worth thousands of dollars seems very questionable.
The hope seems to be to persuade AAMD to rescind its guidelines. But those guidelines were created in response to a recognition that the antiquities market is being fed by looters. One has no way of knowing how many of the 67,500 "orphaned" artifacts were orphaned from their contexts by Bulgarian, Cypriot, or Turkish looters, but we do know that site looting of these countries' Greek and Roman sites is ongoing.
That does not mean that the guidelines in themselves will have much if any effect on this ongoing looting, at least not in the short run. The market will continue to function, and "orphaned" antiquities will continue to flow into it. But at least the guidelines lay down a challenge to dealers and collectors: figure out some way for your industry to play a progressive role in reducing looting and clean up its act by establishing a strictly licit market. Come up with a plan like that and maybe bringing in the orphans can be part of the final deal.