From Specialized:
Either click on Bike Registration” or “Roval Registration” at the bottom our website or access the registration form directly. Follow the directions as prompted. You will need the serial number to register. For bikes, the serial number is located on a sticker on the underside of your toptube and/or downtube as well as on the underside of your bike, underneath the bottom bracket. Specialized serial numbers typically start with the prefix “WSBC,” “WUD,” “STT,” or “STE.”
the sticker looks ok…its a used bike…depending how much it was used, i can see the sticker be worn out…
might be fake…
https://support.specialized.com/home/counterfeit/topics/identifying-counterfeit-products
look on how to id fake products…
ask to see the BB serial number…plus more than the one number he shows…like ask him to send a pic with the first 3 or 4 numbers… (both top tube and bb)