I've had some time to go through the various comments on the regulations.gov website. There were a lot of well written statements, but here are the four best in CPO's opinion that don't focus on the issue of coins:
Supporting the MOU
Statement of Drs. Richard Levanthal and Brian Daniels of the Penn Museum
Testimony of Dr. Selima Ikram, Society of American Archaeology
Questioning the MOU
Statement of the Association of Art Museum Directors
Former CPAC Member Kate Fitz Gibbon's Comments
They are well worth reading in full, so CPO will not presume to characterize what they say.