How secure is the delivery of the signature card by post?

[Webinar_Question]

If a supplier requests the signature card and it is physically delivered as a package - how can it be ensured that the supplier certificate has not been used maliciously beforehand without being noticed?

[PNO-IT]

If a supplier requests the signature card and it is physically delivered as a package - how can it be ensured that the supplier certificate has not been used maliciously beforehand without being noticed?

The smartcard is locked and secured with a transport PIN (16 digits). We deliver the transport PIN after the card has reached the person who ordered the card. This is done in a secure way (PrivateBin).