Things to look for when buying used?

I have had the opportunity to pick up 4 12" skar Ivx V2 dual 4 ohm for $200. I only need 2 of the 4, so I was planning on selling the ones I don't need. He did say that one of them had a cracked cone so I was planning on selling that one for cheap. Are these subs worth buying used? If so what should I look for before making a decision?

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Alright, thanks! I'm gonna buy them new

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