It's for discovery. They're suing so they can see the paperwork on the sales.

This is a routine tactic in bigger business that's even been used on Ryan Cohen; You may recall Boston Consulting Group trying to sue him and claiming that it's because they deserve some of the money he's made in GME due to provided consulting services. However, BCG was trying to dismantle the company and their influence would have resulted in a bigger loss or even delisting. BCG, though, wanted to see Ryan's 5-year plan as "Evidence" in the case, and you know that was the real gold nugget. They never expected to win the case. They wanted the plan so they could hand it to Kenneth Cordele Griffin, Founder and CEO of Citadel and associated subsidiary companies, who rigs the stock market in his market maker capacity, who has been penalized 59 times for trading violations, who has been banned from multiple international trading markets for stock manipulation and fraud, who was charged $11 Billion USD by South Korea for algorithm trading, who won't share his mayo, and who just happens to also be the very same person currently being sued in this art case, and whose involvement is exactly the same as a previous case where things just seem to fly upward and catch fire when he's around.