The boxes on the back are for the postman/woman to indicate the cause for returning the card (if not delivered).
Mr postman: please indicate with a X the cause of return:
Rehusado- refused
Desconocido - unknown
Se ausento sin dejar señas - Has gone and no forwarding information is known
Dirección insuficiente - Address insufficient/incorrect
Fallecido - dead
Otras causas - other reason

Who are the good guys, now that is an imposible question to answer. Is there such a thing as a good politician  :-/