You can definitely submit the 67EPQ note in question to PMG under their “ReGrade” service, in which they will take another look at it within the holder and decide if it deserves a higher grade.
I think the only way they would give the 67EPQ note a 68EPQ grade was if the note was obviously a 68EPQ and they just missed it. If it’s a close call or a borderline 68EPQ, I would be surprised to see it get the higher grade. I don’t think TPGs like to be told they are wrong and will only give the higher grade if it’s obvious. Keep in mind that while predefined criteria is used to determine the grade of a note, it’s still ultimately the opinion of the grader that determines the grade and how they viewed the note while it was in front of them.
If you include a 68EPQ note with the 67EPQ note, since it wouldn’t be on the submission form as a note that was being submitted for a PMG service, just as a “see why you mis-graded this other note”, it shouldn’t make it to a grader as it’s not part of the order. And even if it did, I’d be afraid that PMG would look at the 68EPQ next to the 67EPQ and downgrade it to a 67EPQ because they look the same.
Forum members have reported notes being submitted to PMG for their ReHolder service only (not a ReGrade), and have had their notes returned with lower grades that the grade they had when they were sent it. Personally, I wouldn’t give them the opportunity to downgrade a 68EPQ to a 67EPQ.
Just my $0.02...
Enamored with VF-35 and lower grade PPQ/EPQ notes!