Following a court hearing in New York on Tuesday, Sotheby's reportedly could open its books on some private transactions with a client in a legal tangle. 

However, “Sotheby’s will only produce documents in the event it is ordered to do so by the court,” lawyers for the auction house said. 

Billionaire Russian art collector Dmitry Rybolovlev, 49, is seeking sales details for his high-profile lawsuit against Swiss "freeport king" and art dealer Yves Bouvier, whom he accuses of fraud in overly marking up artwork by the millions of dollars.

The New York Post reports that 15 of the 38 artworks that the Russian collector purchased from Bouvier came through Sotheby's.