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for (@{ $data->{'mail-item'} }) {
    push @statements, {
...
        statement_data => $_->{'mail-statement-date'}
    };
}

push @statements, {
    job            => $_->{'mail-jobnum'},
    product        => $_->{'mail-prodnum'},
    statement_data => $_->{'mail-statement-date'}
} for (@{ $data->{'mail-item'} });