Well, the paperwork does NOT come by itself. I contacted Barb today to order the nose wheel fairing doublers in response to SB 12-08-09 and also asked the question about the paperwork. Barb forwarded it to the appropriate person at Van's which appears to be Cynthia (cynthias at vansaircraft dot com) and she sent me a Word file containing a form I had to fill out and send back. The information provided to generate a Bill of Sale is the kit model, the registration type (ELSA/E-AB), the avionics style if an RV-12 (D-180 or SV), serial number, name of person or business who purchased the kit, physical address of person or business.
Bill of Sale documents are generated on Thursdays and mailed out on Fridays as a note in the document stated.
I provided the information and am now waiting what happens next. Will keep you posted.