You can submit an abuse report against the seller, but since he or she wasn't the one using it for griefing purposes, I don't think it'll go very far. You can also submit an abuse report on the griefer who used it, if you know who that was. I hope you took screenshots, so you can use those as evidence.
There are often "griefing" HUDS available on the marketplace. They're not necessarily intended for that purpose, but often it's pretty thinly veiled. Unfortunately, they're probably never going to go away, because the creator can easily say "Yeah, but I didn't MAKE them use it for griefing." Until a lot of people have a problem with it and a lot of AR's are filed against it, your best bet is getting the griefer; I don't think you'll get the object. (Filing an AR on the creator doesn't hurt, though.)
I was once advised, by a Linden who deals with such matters, to go to the inworld store and AR the vending machine there for Incitement to Break ToS (or something similar). If that's not possible, simply submit an AR from anywhere, giving the marketplace URL as the location of the abuse.
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