Ubuntu – How to check if the Intel processor is genuine

I recently got an assembled PC. The PC was not assembled in front of my eyes. And the seal for each component's (the processor, the graphics card… etc) box was not removed before me. I just gave my specifications to a 3rd party computer assembling shop and got it assembled. Now I want to know if my Intel processor is genuine. So I tried getting the processor's serial number using the terminal (I didn't want to risk opening my PC myself).

The command I used for checking the processor's serial number:

sudo dmidecode -t system | grep Serial

The output given by the terminal was : Serial Number: System Serial Number.

Does this signify that my processor isn't genuine (I paid for a genuine one)? Or is it just that some motherboard’s BIOS don't retrieve this information from the processor?

Or is there a better way to figure out if my processor is genuine (without disassembling the PC) ?

Additional Info:

command :

$ lscpu

Output:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 158
Model name:            Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz
Stepping:              9
CPU MHz:               900.000
CPU max MHz:           4200.0000
CPU min MHz:           800.0000
BogoMIPS:              7200.00
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

(omitted flags)