People are being wanted to follow the rules when importing goods - after a sharp rise in detained mail.
More than 50 parcels have been seized by Customs and Excise so far this year: last year only 12 were stopped.
After Britain left the EU in January, goods sent to the Island from outside of the UK have been subject to new rules covering animal and plant materials.
Environment, Food and Agriculture Minister Geoffrey Boot says people should check the guidance before buying online, as controlled items could be detained and destroyed.
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