What you have is a seller making a claim about his product. If you read the copy in that auction it says something like "This thing is new. If you don't agree, I'll give you your money back." There are several things to consider about this claim.
- Do you trust eBay sellers as a matter of course?
- Or, do you trust the seller sufficiently after having looked closely at his/her feedback?
- Do you trust eBay to enforce its rules if you are defrauded?
- Or, (US only) Do you trust in your credit card company to reverse the charge if you go through the necessary notification steps to comply with federal law?
- Or, do you trust PayPal's "buyer protection" insurance, if you choose to pay that way, and to pay the insurance fee on top of the auction price?
All of these boil down to one question: do you trust the eBay marketplace? eBay is valued by the U.S. stock market at billions of dollars precisely because a large number of buyers do trust them to provide a fair marketplace.
Personally, I try to judge the veracity of a seller's claims by looking at the photos, and reading the claims. I also look at a seller's feedback. Not just at the percentage number, but at two or three recent transactions, and at least one negative feedback, unless these are unavailable. (Most real people who sell on eBay will have at least one or two such feedback entries.) If I were in the market for a pristine 15C, I would view a photograph like the single one included in the referenced auction as inadequate, and I would ask for more. I would decline to bid if I didn't get them, too.
But after all is said and done, I trust the eBay marketplace, in combination with consumer protection laws in the U.S. If I pay with a credit card, I can get a refund for any item for which I have a record of unsatisfactory correspondence with the seller, and proof that I returned the item to the seller. I have never needed to resort to this for an eBay transaction! I've been doing a lot of buying on eBay, too. But, I do read the auctions carefully, and I do scrutinize the sellers. And I will frequently pass up a chance to bid if I don't like what I see. For the last several years, that approach has worked well for me.