They transfered 52,189 BTC between May 7th (When UST dipped to $0.9978, indicating the algo peg was under stress) and the 10th, and another 33,206 when UST hit $0.75. After the insiders were paid off, Terra was free to go to zero.
Presumably we'll only find out what actually happened when Do Kwon is in jail and people start testifying against each other in return for lighter sentences.
