depends upon your definition of treasure, to some it simply requires a certain amount of monetary return. For instance in the Tankerness area of Orkney several mounds were excavated over time because one farmer had found what he termed treasure under one on his own land. And certainly it lay behind at least some of the 'barrow-diggers' work in Britain as a whole.
But, as the others say, mostly robbed cairns are simply robbed of stone in the same way as archaeologists talk of robber trenches.
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