Shim's bag was inspected, revealing 100 hidden cigarettes.
The search was then upgraded and five packets of vegetable seeds were found concealed in a zip pocket of a pair of trousers in his bag.
All of the products were seized.
"Mr Shim admitted to trying to hide the seeds in his trousers so they wouldn't be discovered by the quarantine officers. All returning passengers arriving in New Zealand must complete an arrival card and declare any risk goods they wish to bring into the country," said Simon Anderson, the Ministry for Primary Industries spokesman.
Anderson said bringing unauthorised goods into the country by any method, whether smuggling through the border in person or receiving products by mail, puts New Zealand's biosecurity at risk.
New Zealand's isolated position and its high economic dependence on primary industries, makes it particularly vulnerable to the introduction of any invasive pests and diseases through the importation of "risk goods", he added.
Shim was also fined by New Zealand Customs for undeclared cigarettes.
- RNZ>