Under which circumstances may boxes containing card stock remain unsealed within the vault?

According to the PCI Card Production and Provisioning Physical Security Requirements, the vendor must ensure that all boxes containing card stock are sealed with tamper-evident tape or labels when stored in the vault. The vendor must also maintain a log of all card stock movements in and out of the vault, and reconcile the card stock inventory at least daily. The vendor must not leave any boxes containing card stock unsealed within the vault, regardless of the frequency of stock pulling, as this may compromise the security and integrity of the card stock and increase the risk of unauthorized access or theft. References: PCI Card Production and Provisioning Physical Security Requirements and Test Procedures v3.0, January 2022, pages 12-131