The theft occurred on May 8, though Green only seemed to notice on May 17 when he tweeted, "Well frens it happened to me. Got phished and had 4NFT stolen."
The loss of the Bored Ape was later revealed to have put Green in a bit of a pickle, when he released the trailer for a new animated series he was developing that starred his pilfered primate. Given that BAYC ownership grants commercial usage rights (which are presumably transferred to the new owners when the NFT changes hands), the person who bought the NFT flipped by the phisher could have possibly brought a lawsuit against Green if he moved forward with the series.
Green ultimately spent about $300,000 to buy his ape back from the hacker.