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  if ( $q->param() ) {          #if params are not undef
      # ignore deleted
      next if ( $q->param("box$post_number") );

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# Pull out the numbers of the checkboxes that were selected.
# e.g. If box1, box3 and box12 were selected, @selected = (1, 3, 12)
...
open FH, ">$filename" or die "Can't write to $filename, $!";
print FH @posts or die "Couldn't write to file, $!";
close FH or die "Can't close file etc, $!";