I've sent emails to Titleist customer service but did not get a reply back. I'm interested in sending in my clubs to Titleist to verify if they are authentic. I recently purchased a set of AP2 712's from Ebay...yeah I know "cardinal sin", and it did not have a security sticker on the 6 iron. Since it was a custom set, there are serial numbers on all the hosels and when I checked with Titleist, they told me that when they left Titleist it came with a different shaft. I've have also tried to do a side to side comparison with genuine clubs from GG and they look the same. Lastly, does the paint-fill come off easily on these clubs, cause I noticed on the 8 iron the paint-fill on the hosel "712" the 2 is rubbed off or missing. Possible that the factory missed one?