Test or Unpainted

Test Pez are also called "Backdoor" pez  for a couple of reasons.  When Pez International creates dispensers  with different colors to "test" if they would sell the ones they do not plan on selling to public are supposed to be destroyed, but workers will sometimes take the dispensers home and sell to collectors.  Also workers in past were allowed to take dispensers home to paint.  These dispensers were also sold out of their backdoors, thus the name.  

Some of the Pez here could actually be considered Fantasy since it's not known where they were created or who created them.

Also, some of these could easily be considered regular pez that have not been painted.