First, you will probably want to return that because it’s an old generation. The reason you can’t find any current hubs is because Samsung is getting out of the smartthings hardware business and has turned over manufacture of the hubs to partners. The partner company for the US and the UK/EU is Aeotec. So the current version of the V3 hub is the one from Aeotec.
https://www.amazon.com/Aeotec-SmartThings-Gateway-Compatible-Assistant/dp/B08TWDNQ5Q/
Official announcement on the shift:
An Update Regarding our Hardware
That said, there were a couple of variations in the second US generation made by different factories and they had different model numbers. there was a very slight difference, for example, in the status LEDs, but other than that they are the same and use the same firmware.