PS Audio XStream biwire, what are they worth?

I hope this is the right place, I've got a question about the value of some cables that came with a set of used speakers I picked up. They are the XStream biwire, 4.0m, pair of them. The guy said he spent $1700 new, which looks about right. I don't need massive cables and would like to know if they are worth selling or not.

If they are worth under $500, it probably isn't worth it for me to sell them.

Thanks guys.