The investigation found 1,600 works traded through shell companies, including Banksy pieces bought by a London financier charged with tax evasion.
The shirts, which feature an empty plinth and rope, have already sold out.
The sale confirmed predictions that the painting’s unconventional backstory would only increase its value.
“Girl with a Balloon,” which started shredding as soon as it sold in 2018, could fetch more than $8 million.
Banksy confirmed the artwork in a clever video stitched together with a Bob Ross tutorial.
After the mural appeared on the for-sale home, its owners swiftly took the house off the market to consider their next steps.
Banksy’s “Show Me The Monet” (2005), a riff on Monet’s paintings of his Japanese bridge in Giverny, has achieved the second-highest price ever paid for a work by the street artist.
The European Union Intellectual Property Office ruled that the street artist, who remains anonymous, could not be identified as the unquestionable owner of his “Flower Thrower” stencil.
In a video about the rescue boat, which exceeded capacity this weekend and declared a state of emergency, Banksy says that EU authorities “deliberately ignore distress calls from ‘non-Europeans.'”
The artist’s bright pink motor yacht has already rescued 89 refugees in distress in the Mediterranean.
An employee of the London Tube noticed “some sort of ‘rat thing’” a few days ago and cleaned it off.
The framed painting is now hanging in the Southampton General Hospital. It will be auctioned this fall, with proceeds benefiting the National Health Service.