Today, 24th August 2013, I received my 3 photos in another envelope unsigned, with what looks like the standard ARG pre-print/autopen. However, I'm thinking this may be authentic. All of the other successes on fanmail.biz seem to have the "cliffe" from Dan's surname on his neck, whereas on mine it is signed part "l" and "iffe" on his neck, there is also a variation on the D, the horizontal line normally goes on for quite a bit longer than it does on mine, as does one of the diagonal lines. You may also want to notice the variation double f, seems very different from other AP/PPs...
Photo:

Envelope:
http://img833.imageshack.us/img833/7440/iznv.jpg