The thief sold all the NFTs and then transferred the proceeds from the sales to their own wallet. Altogether they made off with 127.3 wETH (~$208,000).
On Twitter, hideyoapes explained that they had downloaded and installed the MetaMask wallet extension from MetaMask's official website. "I didn’t think anything of it because it was the legit site and verified chrome app. While I was sleeping all my assets were sold," they wrote. At this point, it's not clear how exactly the hack was perpetrated.