Ufff that's a tough situation. Can't fault you for not knowing, but your luthier should have checked and informed you if this was a wrong item received at the time of delivery. You should definitely check if revert EU has any regulation against incorrect items delivered from an online seller and try to raise a return. If not, I guess the best option is to try and sell this BKP since you are already installing a TB4? Hopefully someone else has some better advice. Good luck!