I usually stick to authorized retailers and the TaylorMade website. It’s safer that way!
A little humor: I bought a set of ‘TaylorMade’ clubs from a guy named Ted, who also sold me a bridge! 
Always verify!
Haha! That’s a classic! Always trust but verify, right?
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Using a serial number lookup is crucial, but always analyze the clubs in person if possible. It might save you from future headaches.