It's easy to visually see the mistakes that may affect the reviewer's following process, such as sending to Fast CATALOG or LKQ or reporting to the Adjuster or Insured.  

Visually, it's easy to see if the wrong items are in a cleaning box if multiple items are mixed on one line item where there should be multiple line items, or poor images, etc.  

Once you understand how to review a pack-out visually, you will want to do this all the time, as catching issues before you start processing will save a lot of resources if these issues go unchecked.