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The mask is thought to come from this looted tomb (from National Geographic)

Río Azul

Remote Classic Maya site which was extensively looted in the 1970s for spectacular grave goods.
Rio Azul Mask from National Geographic

Río Azul Mask

A Classic Maya funerary mask apparently looted from the Guatemalan site of Río Azul and illicitly trafficked into the United States and then Europe.
Rio Azul Vase (1984.12.A) The Detroit Institute of Arts

Río Azul Vase

A Classic Maya vase now in the Detroit Institute of Arts that is thought, based on linguistic evidence, to have been looted from Tomb 12 at the Guatemalan site of Río Azul in the late 1970s.