The Poste Restante is intended solely to
cater postal communication needs of strangers and travelers. They,
however can not use the Poste Restante for more than three months.
All articles superscribed "To be kept till
called for", "To wait arrival", or in any similar way, and also articles
addressed "Post Office" are held to fall under the classification "Poste
Restante". A Poste Restante article is kept in the post office:
For a period of two months from the date on which it reaches the
designated Post Office in the case of Karachi.
For a period of one month in all other cases.