If, like I do, you have a VISA card attached to your PayPal account (you are only liable for $50 if your paypal account is compromised or the number gets out vs. unlimited for attached bank accounts) I have found that my bank, who issued the VISA, is the best recourse for a refund. I've had items not shipped, just never arrived. eBay and PayPal, both with their "buyer protection" did absolutely jack sh#t for me. Their "insurance" relies on their ability to put pressure on the seller by restricting or cancelling their account. You will never get a nickel of THEIR money even though they've collected a fee for the listing and have their "buyer protection" propaganda plastered everywhere on their sites. Most times this will be enough, but the savvy rip-off artists know that they can send you back $10, then tell PayPal/eBay "hey, I met him halfway, we negotiated an agreement" and that's all you'll ever see. VISA, on the other hand, has never let me down... my VISA has automatic purchase insurance and they DO NOT bitch about it, especially if it's a small value (i.e. would cost them far far more to pursue than just pay you).
It's really too bad that people are so unscrupulous. Just learn:
UNTESTED = BROKEN
AS-IS = BROKEN
NO WARRANTY DUE TO AGE = BROKEN
UNIT POWERS UP = ALMOST ALWAYS BROKEN
DO NOT HAVE EQUIPMENT TO TEST = BROKEN
and the list goes on. I don't buy from people who can't write in proper sentences, call me prejudiced. I also don't buy from people who won't answer my questions thoroughly... it's pretty easy to tell when someone's committing a sin of omission when you get an oblique or incomplete response to a very simple question. With really old stuff, vintage tube equipment and the like, at the very least I need a "non-DOA" guarantee if the thing is listed as working. Most times I just assume it isn't and go after broken stuff I think I can easily fix. I'm right about 95% of the time.
Now boxing properly for shipping is another matter altogether... for another thread.