What the complaint here is about is MISREPRESENTATION of who the mailer and returnee really are.
Looking through all of it I don't see mail fraud unless they've not paid their postage. You can find out who every party to this mailing is by calling Lansdale PA post office ~ they will tell you holds the permits and who the mail receiving agent is for the post office boxes at those 9 digit zipcodes.
There are no secrets in this although it might not be immediately obvious to the inexperienced.
BTW, asking some one for DOB and Social Security number isn't prohibited last time I looked.