BBC:

Gold masks like this (not among the treasures found) were associated with funerals
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Antiquities including four helmets and gold funerary masks from the 6th Century BC have been seized by Greek police in an anti-smuggling operation.
Two arrests were made during the operation in Thessaloniki, which was hailed as a "great success" by Prime Minister George Papandreou.
Among the 70 items found are pieces of a golden diadem and an iron sword decorated with gold leaf.
Such objects were usually placed in the tombs of ancient Greek nobles.
Read the whole story: BBC