Not sure, but I think there may be other ways to verify the purchase they the seller can work out with XenForo. If not, your only recourse is to chargeback (assuming you have already paid, and move on to the next.
@@Bdrunkz , I have moved this thread to completed. I presume you refunded @@gnoe money due to not being able to produce the necessary info to XenForo. Should you find this info in the future, please feel free to create a new thread