I wonder if this is the Gregor MacGregor (there were a lot of them) who was a notorious swindler and confidence trickster, whose bond-market funds ran to £1.3m (about £3.6 billion in today's money). In which case we can guess what was in the document wallet! See the article in the Economist of 22 December 2012. This Gregor MacGregor was born in 1786 but the painting looks to be a bit too early to be him.
It's coming yet for a' that,
That Man to Man, the world o'er,
Shall brothers be for a' that. - RB
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