I called PSA customer service and got the reference to their website resources:
https://www.psacard.com/resources/gr...andards/#cards
Under the No Grade definitions drop down you’ll see the entire list of probable cause items that would result in a N-# flip return to submitter. You can always ask for an authentic or authentic-altered flip.
Pressing creases falls under N-5 and would result in no numerical grade.
So I think that answers the question. No need for additional emails to Joe Orlando