we had some similar pattern when i worked as aff.manager for AP which had that time a own aff. program
we seriously had no idea how the guy did it, it all seemed legit just that it somewhat couldnt be, cause it was same as you that the traffic litereally came from nowhere, no refferer, nothing on lots of sales, always full price,
it was clear to everybody it must be a cheat so we had to shut it down, although was a hard one, if you still facing those issues i ll hook up the old owner and ask if he ever found out more about how it turned out later with that affiliate.
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