There are many creative ways to "munge" documents in a copier if you wish. Think about placing a dirty transparency on the copier first and then the document. Think about then crumpling the first generation copy and sort of smoothing it out before recopying. Not to mention the distorting effects of plain clear water & a dry-out before making another copy.
None of those ways would introduce some of the specific types of distortion that are present in the documents. They were clearly faxed, and I'd like to see a pixel-perfect sample of a real page sent from that Kinko's to see if the first-generation fax was produced there.