I'd suspect that it's the SAIS immobiliser. Forget how long immobiliser have been mandatory in OZ.?
The head of the new key needs to have a chip inside which needs to be paired with the master key (red key). Most manufacturers provide a red master key & a pair of slave key's - the red master key is important & manufacturers recommend putting it in a safe place (not for daily use). The red master key is used to code a new slave key hence why any new key has to have a chip inside it.
It's possible to reverse engineer a slave key to the immobiliser transponder or another slave key using a special electronic device - but it's not cheap...
Any reputable locksmith would check any automotive key that has a non metallic head for the presence of an electronic chip before cutting a new blank.
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