Sealed is the only way to ensure that a record is in good condition. I have bought SO many records from 'reliable' sources, which look mint, but only play VG.
That said, occasionally it's been the other way: look only VG but play mint. But that only happens with ultrasonic cleaning, another story.
That said, occasionally it's been the other way: look only VG but play mint. But that only happens with ultrasonic cleaning, another story.