On the back of the strip, a brown residue is noticeable. Photos are great.
The booth is located out in back of the Mixville Bar: go out the black door to the courtyard and the booth is at the left. The courtyard is great to sit, drink, and relax in, especially in warm weather while you wait for the photos to come out.
UPDATE 6/30/16: Andrew reports that as of his visit in June, 2016, this booth is still working.
Contributed by Ricky Romero, Andrew