Cipher Key is a Text Log slate which has a mass of 0 and is worth 0. It is subtitled "Shipment delivery instructions". It contains coordinates.
This
slate contains the following message:
When making your delivery, you will be provided with a slate with a serial number associated with it.
Use the key to multiply each digit to get the password. This will unlock the slate and provide the coordinates for where your shipment will be sent.
Key = Odd numbers x 1, Even numbers x 2
Number to Apply Key to = Slate #Example:
Supply Slate #12345
Password = 14385