Write in your hours. For shipping and receiving departments that change hours of operation, consider using a dry erase pen/marker. For signs with lamination, the dry erase markers work well and can be easily wiped off and changed.
Shipping and Receiving Signs
24 Hour Surveillance
Damaged Shipping Labels
International Fragile Shipping Labels
Shipping Service Labels (UPS & FedEx)
Here are some other products with a similar message. Click on a design to see more details.