ASEC_APE had just purchased the four NFTs between July 15 and August 13 for a combined total of 326 ETH (~$532,000 based on ETH prices at the time of each purchase; ~$631,000 at the price on the day of the theft).
One of the stolen NFTs, Bored Ape 9012, had just been stolen a week before from Cameo CEO Steven Galanis when his wallet was compromised, as were a handful of other pricey NFTs. ASEC_APE had purchased it from the person who purchased it from the hacker shortly after the August 6 theft.