No serial number on the back cover of MacBook Pro 13 a1502 2015?

Question

macbook

Good afternoon.
I want to buy a MacBook Pro 13 a1502 2015 i5-2.7 8gb.
I found an option that I liked, but there is a question:
- there is no serial number on the back (bottom) cover (photo). Claims that on A1502 models - there was no CH on the cover, only in the parameters. Could this be?
- the battery was replaced, the seller claimed that they did not change it, but it is fresher than the laptop for 4 years. 2 charge cycles (photo)
The seller agreed to remove the cover. Came to see friends at Apple service. They removed the cover, the battery is original, it seems that it was not changed in time (there are no service stamps), it was assumed that the replacement was carried out in the official service. Also, they indicated that they were untwisting the mother plan, disconnecting the cable. The laptop is clean inside, the thermal paste is perfect, nothing suspicious.
The laptop came from the states, the seller does not know its history, unfortunately.
Is it really possible that these models did not have CH?
Isn't it scary for the battery if it has not been discharged / charged for almost a year? There was 1 charge cycle.

Answer 1

Maybe a refab?
Below is a photo from my A1502