^hes saying the buyer can claim the box with the same serial number arrived, but was empty.
ie: you ship me a gpu i bought via ebay/paypal. it arrives but the box is empty, except for a 2lb paperweight (about what the gpu would have weighed). i send ebay/paypal a photo of the paperweight sitting inside a box that has the advertised serial number. clearly you shipped the advertised box, but theres no way to prove that it contained a gpu and not a paperweight
If you record a video where you put a special seal on the box, that would be very hard to get around.
I will weigh in here and add that I no longer sell on eBay either. I have had a similar experiences to that of philipma1957 and adaseb, and in my case a buyer claimed he got a defected card 3 months after he received it.
First off, I don't sell a GPU unless I am 100% confident it works. Every GPU I re-sell I have flashed back to original BIOS and install it in a test rig that I have several games and benchmarks installed on. I will run the Furturemark benchmark suite at the highest level for the given card, and also briefly fire up and play a few demanding games to make sure it stands up to real use. Once satisfied, I remove the card, gather all accessories, replace dust caps, etc. give a final quick dusting, and package the card up while taking photos for the auction.
I had been documenting all eBay transactions with photos after having a few close calls before. I had my listings show the serial number of the cards in one of the listing's photos, I even put the last 6 digits of the GPU serial as part of my listing title. I clearly described the cards as used along with their age and that I did not accept returns. Once the GPU's sold, I took another set of closeup photos of the GPU with the a copy of the winning bidder's invoice showing the auction number, his name, etc. along with the card's serial number and closeup shots of all angles. I photographed it going into the retail box and even into the final shipping box. I took the box to the post office and got a receipt showing drop-off time and weight of the package (to show it wasn't empty). At the time, I too thought I had plenty of evidence.
The buyer opened up a case and said the card I sent him was DOA and had a picture of some other card with clearly blown out components, but it was not even the same make/model as the one he bought. It was indeed too long of a time for eBay, but PayPal sided with him stating that my photos didn't prove I actually sent the card pictured, only that I took pictures of some card. FYI...PayPal now allows buyer to contest a purchase for up to 180 days!!! I asked them what form of proof they would take in case this would happen again in the future and they could not give me an answer. I tried to escalate the claim as far as I could but eventually just gave up.
Since I had good experience's previously, sometime later on I tried to sell another GPU and almost instantly I knew I made a mistake. First sign of trouble came when buyer began asking if I sent the item out yet, when the tracking information was clearly visible. A few days later, sure enough I get a item not received claim. I log in and click on tracking and it shows the item as delivered. I reply back with this information and the guy claims he never received anything. I double check his address with PayPal and everything checks out, and think I am covered by PayPal's seller protection policy. No go, as it turns out due to the previous incident months earlier I do not qualify for the program as I am now considered a bad seller. Before this I had been an occasional seller of many items for over 5 years with over 800 positive feedback and thousands of dollars of transaction history so would have thought I would have more credibility that some 0 or 2 feedback buyer.
These are just two example of where the buyer was successful in his scam, as I have had numerous "close calls" when I state the card was used, I offer no returns and most of the cards I sell are still under the manufactures warranty anyway if there really was a problem. Some might complain a bit but have never pushed it all the way.
Anyway, I have since closed both my eBay and PayPal accounts as they seems to have been taken over by scammers. I now try to sell via Craigslist or local paper ads, and even though it is a much smaller market and usually a hassle, occasionally I am successful. Plus without having to worry about the eBay/PayPal fees, I can usually offer it for $10-$15 less than online and still make more myself, so a win/win for both buyer and seller.