SirPrimalform: I don't follow your logic. Game the system how?
If he was trying to pirate the game by buying it, downloading it and then getting a refund, what would be the advantage of doing that twice? The installer is DRM-free, you only need to do it once to have as many 'copies' as you want.
True, but if I was the support rep and saw that he had bought two copies of a game and was now trying to return them (or one of them, not sure whether he actually attempted a refund for the gift copy for his son, or how that works for a redeemed gift) I'd be a little suspicious.
Maybe there's no advantage to doing it, but I would certainly find it unusual and be less likely to give a refund (considering it doesn't fulfil any criteria to actually be eligible for one in the first place) then if one copy had been bought.
*shrugs*
Maybe that's just me though.