2023 or 2025 version? If you are in the US, is the seller in the US? Are they listed as new? Did you pay less than $200 per club if they were listed that way? Is the seller an authorized dealer? Is the seller an online reseller? Are you sure if there is a refund policy if not authentic?
Forgeries are getting so good that unless there is a glaring error, us zealous end users can miss a detail. I will only buy from an authorized dealer or the online site of a dealer like 2nd Swing or Global Golf. When the price is too good to be true and the seller won’t commit to take a return, then the deal is not true.
Clubs are expensive, but if the chain of custody can’t be verified, the risk is not worth it. These questions come up all the time on this end users discussion. Best to do due diligence prior to purchase. It comes down do you trust the seller?

Call Titleist they can confirm it for you. They look real, but you can never tell. I was thinking my serial number was on my 7 iron.