The pickure of the invoice looks like it's made on windows 7 + quickbooks 2011
using the "executive template" suggestive of Sotheby's flourish for paperwork /s
"For Green, dabbling in the dark art of money laundering has ended poorly. He has been indicted in the United States on six counts of attempted money laundering, and his gallery in the Mayfair district of London has been declared insolvent by British regulators."
Ill-gotten. It wouldn't surprise me if overpriced art was a major avenue for money laundering. Secret buyers, ridiculous sums of money, and paintings vanishing into private collections would make it perfect for that.
https://archive.ph/0wTb9