Forgeries already exist, no AI needed. So arguably the detection method would be the same. But in a more general sense, whether that happened depends on what y

Forgeries already exist, no AI needed. So arguably the detection method would be the same. But in a more general sense, whether that happened depends on what you mean with "publish". If you mean "someone put it on Twitter and no one corrected them" then yes - it happens all the time with highly-anticipated books (I definitely read at least two fake Harry Potters back in the day) and no one corrects them because they are obviously fake. Now, if you mean "a respectable publishing house put it for sale" then I doubt it happened. No decent publishing house would take (say) a new Lovecraft before giving the state a call and/or asking for the receipts.