There was definitely a time where if you booked a wine excursion they looked the other way when you brought wine back with you on the ship.  But otherwise there was a table just inside security where you left wine purchased on shore to be delivered back to your state room on the last night. But this takes personnel and when the ships were understaffed they may not have wanted to assign people to this task so everybody could bring anything they wanted onto the ship. As staffing returns to normal