Oh no, questions like this, regarding pressing, can be very controversial and many get upset. I will answer with MY OPINIONS but be prepared for some backlash. First off, a properly pressed book should offer no clues that it was pressed. This is the reason CGC decided they would not regard pressing as restoration because they could not always tell. The characteristic you described, the right edge pages not lining up, can be from pressing but not always. IMO, it depends on the severity of the fanning and other characteristics of the book to determine if it's from pressing. I hate the look and simply avoid books like this. Other signs of a poorly pressed book are extremely flat spines, a natural spine should be a little plump with a rounded look. Take a look at the spine of a book fresh off the stands. I can offer more information but I don't feel like reacting to the forthcoming comments.