How can I tell if my Fender Guitar is an orginal or copy?

On the wooden part at the top of my guitar it says ''Squier strat by fender'' and on the tip of it, it has ''affinty'' on it, on the back theres a metal plate saying 20th anniversary squier freedon of impresson since 1982. on the back of the wooden part it has ''crafted in china s/n'' and CY and a few numbers.