Steel Extraction Location and Default Recycled Content Questions

The “Special Considerations for MRc5” section on LEEDuser under Schools 2009 notes the following: “The extraction location for the source of the recycled content can be the location where the recycled material was produced or collected. It doesn’t have to be where the virgin material was harvested from.” How does this relate the “Harvest” location on LEEDusers ENVIRONMENTAL MATERIALS REPORTING FORM for structural steel items that have a great majority of recycled content? I thought that I had read somewhere that if scrap metal is taken to a mill and melted down to form a new metal that the mill location is the new harvest location. Is this true? Also, can we make use of the 25% post-consumer default recycled content value for steel items without providing any documentation under LEED for Schools 2009?