Under the name of the gpu there should be some parts number or serial number i guessNot sure what you mean by "missing".
Did you black out the end of the serial number or is that the question?
In other words the serial number tag was blacked out when you received the GPU.
Where did you get the GPU? Source?
Here is the info about the GPUOn the label RX is likely part/model number with version.
SN = Serial Number.
Obscuring the SN as shown in the photograph blocks the use of a barcode scanner.
Could be fake and the serial number obscured to prevent or inhibit discovery of a counterfeit product.
Or some other misdeed.