Originally posted by Skyntara I'm guessing I just send it back registered post and request a refund. Not sure on the procedure exactly as I've never returned anything from ebay and the guides don't explain what to do.
Do make very sure that you return it with a postal service that:
1) Shows status of transit/delivery online.
2) Shows the postal code/area code of the business/residence it's returned to.
3) Because of the high value of the item, use a postal service that requires a signature before it will be handed over.
All three of these things are NECESSARY, or else the seller, if they are unscrupulous, can basically say they never received it while holding it in their hands and keeping your money. Again, all three are necessary; having just one or two will not secure your refund, and neither will something like if your online tracking information only shows the town/state/county it was delivered to and not the postal code.
Also, you can expedite your refund by calling up PayPal and telling them it's been delivered successfully after you've confirmed it yourself online. 90% of the time, they will instantly refund you over the phone in a matter of 1-3 minutes.
One more thing, I wouldn't leave the seller a negative if they truly seemed out of the loop as to the condition of the item. I usually reserve negatives for sellers who harass me or are openly defiant of eBay/PayPal policy. A neutral would be fine. Beware of leaving a positive feedback with a negative comment, though, as it can be removed by eBay.
I've got quite a bit of experience with not-as-described items or bad sellers on eBay (unfortunately), and I've always successfully gotten a good outcome. If you really need help in a pinch, feel free to PM me. Sorry about your crummy lens, and cheers!