Should I change my tires?

[670cc]

Dunlop Sportmax on my 2012 NC700X. Online it always mentions a 4 digit date code. This code is 8 digit is that because they are OEM tires? Also, the last four digits are 0208 and 0408 which appears to indicate 2008 for the date of manfacture but this bike was made in 2012. Did the previous owner have used tires mounted before selling the bike? Thoughts?

Since the Sportmax was never a 2012 NC700X OEM tire, as far as I know, then it would appear that the PO had tires mounted that were used, or new old stock.