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  1. or download this
    # get office_id for this office
my $office_id = get_office_id();
if ($office_id) {
...
} else {
   # no office found
}
  2. or download this
    # get office_id for this office
my $office_id = get_office_id();
if (defined $office_id) {
...
} else {
   # no office found
}
  3. or download this
    # get office_id for this office
my ($ok, $office_id) = get_office_id();
if ($ok) {
...
} else {
   # no office found
}