Burying their head in the sand

Amazon REALLY don't want to know if their "vendors" are selling pirated disks. I bought Bones S5 a week or so ago, it was obviously counterfeit on arrival, and there appears to be no way to handle this other than returning the DVD to the seller and hoping that I eventually get a refund. Meanwhile the same guy is selling another copy of the same set of DVDs, "Used - as new"

Don't Amazon think it's a little odd that people have an endless supply of used copies of the same DVD set?