Sandisk USB Flash Drive Serial Number Format

[Rakanoth]

I purchased an Sandisk Extreme Pro 256GB. I need to find out what my product's serial number is in order to register it. However, there are 3 different codes on the back of the USB drive. I can't decipher which one is the serial code:

 

Character (or letter): C
Integer: I
Minus sign (or hyphen): -

 

1.) CCCCIII-IIIC
2.) CCIIIIIIIIIC
3.) CCCC-CCC-CCC-CCCCIII

 

Maybe, if you already own a Sandisk product and have already figured it out so you can help me. ^^
Thank you very much! I really need this.

[TrigrH]

 

top looks like a model number

left looks like a model number

bottom right looks like a serial

 

2)

 

match the drive with that image, if the numbers match its not the serial.

[Rakanoth]

Wow. Thank you so much.