@shinobi76 Samsung batteries can come from both countries (Vietnam and China), so that is not an indication that they are fake. Good fakes are hard to spot and do require a battery analyzer to read the actually EEPROM on the battery. Most common fakery is identified by a battery label that is simply taped over the the original label, which does not appear to be the case with your batteries. That is one of the reasons while most of us on here stay away from place slike ebay, Amazon and AliExpress when it comes to batteries.
I would use the battery for as long as it performs as it should.