2 Cool Cat NFTs were reportedly stolen as a result of the recent (and ongoing)
OpenSea NFT exploit.
It's believed to be a phishing attack timed at exactly the same time that OpenSea was sending its NFT holders a revised smart contract. As OpenSea NFT holders were expecting this email to accept the migration of their tokens from their old contract to their new contract, it sounds like the attacker took advantage of this by duping OpenSea customers into "accepting" this migration, only for the NFTs to end up at an address with about $1.7m in ETH along with stolen NFTs (including the 2 Cool Cats).