"A series of PSA graders review your packs for authenticity and seal. If genuine and unopened, PSA looks for evidence of resealing, repairing and alterations.
If your packs pass these two steps, PSA grades the condition of each pack on a scale of 1-10, with 10 being best. Wear to corners and edges of the wrapper, or staining and toning of the wrapper, will contribute to the grade.
After grading, PSA encapsulates each pack in its own extra thick, tamper-evident case. A label within the case displays the pack's pertinent information and unique certification number."
Eye Appeal:
The eye appeal factor is virtually as important to pack grading as it is to the approach used in trading card grading. There are, however, some unique condition obstacles that many packs are subject to. These include but are not limited to obstacles such as sticker residue that can alter the overall freshness of a pack and, in turn, hinder the grade. The presence of defects like mildew staining and gum or wax bleeding can lower the technical grade and detract from the overall eye appeal, depending on the severity.
In addition, while the centering of a pack wrapper is important, the pack grading approach does not view wrap centering in terms of percentages. The key factor, regardless of the technical measurement of the centering, is whether or not the centering (or lack thereof) of the wrap affects the overall eye appeal.
There are instances where wrapper centering issues are the norm. The wrappers designed for that product clearly do not fit the way that most factory wrappers should. So, in a case like this, the pack graders will take that particular year into consideration before rendering their opinion. As long as the wrapper isn't a complete miswrap or entirely defective, then the centering of a wax wrapper should not hinder the grade substantially unless it affects the overall eye appeal.
Source: PSACard
