As has been suggested, get your trainers on and run away as fast as you possibly can! Irrespective of what they are selling, a seller on eBay with that number of negative feedback's in such a short space of time should be avoided at all costs. Unless you are going to pick an item up and paying in cash I wouldn't touch someone like that.
Then there is the matter of it being a replica kit; these just simply don't fit anywhere near as good as the real thing. Anything that is 'pattern' or 'replica' parts will require a bodyshop to spend hours cutting and filling to get it to look even half decent.
I bought a full US spec JCW
kit on eBay about a year ago and paid £600 for it. That included the front and rear bumper, the skirts and grills, and all the extra bits needed - so they do come up from time to time. Just have patience and keep trawling eBay and the forums...