MacBook Pro 13 2015 serial number problem

[NaturalMlz]

Hello, a month ago I’ve decided to buy Mac. I couldn’t afford to buy a new one, so I’ve bought on OLX (local trading website) MBP 13 2015. It’s working more than perfectly, but... I’ve noticed couple strange things, that I saaaaaadly didn’t catch during trade...
So, on the bottom, there is no serial number! What’s more, the serial number in firmware is not recognised by Apple Website. I’m sooo frustrated, cuz I spent on it whole of my savings, I learn a lot on this MacBook. No idea what to do...

 

[Audit13]

You mean the apple warranty website says the serial number is invalid?

The serial number may be missing from the bottom panel if the panel was replaced with a generic panel.

 

[Timmy D]

you should be able to get the serial number from "about this Mac" in your OS. click the Apple logo in the left top corner

Never mind, I missed that you had looked in the firmware