Toolwarehouse: I did once have customs change things when the customs broker mis classified goods, which meant they had a huge duty on them, instead of the correct classification which had little or no duty
These spare parts are ones that were supposed to have been in a previous consignment but were missing, so any GST/duty had alreeady been paid on them on the previous consignment, its just that the items were missing, so you should not have to pay customs twice on that one item. So there is no cheating involved