we use the postal service a lot for bud & clones etc & the best smell proofer for 24hrs is babies scented nappy bags round the packeage.
chuck bud in a baggy & seal it, put it in a nappy sack & knot it loosely, put in jiffy bag & off it goes - totally weed pong free
seeds?? I'd be more concerned about them getting crushed tbh - some send them out in cd cases so u should stick with them.
sry about ur country btw - nz is a cool place but i had no idea they were so antiweed :/