The IRD are very good at wasting not only paper but postage as well.  Ezypay as your payroll provider electronically file your IR 345 and IR 348 on your behalf either bi monthly or monthly ( unless you have specifically requested as not to )

If you have been receiving paper copies of these forms for you to complete,  please call the IRD and request they stop sending them to you.  Not only will it save you time opening mail it will also save some trees !