The short version is that I logged into eBAY, UPDATED MY MAILING ADDRESS, purchased an item, and they told me they would send it to an old address they had populated from elsewhere.
I immediately informed them, and eBay said, we don't care, tell the seller.
Their contact info for the seller was inaccurate, so I had to hunt them down. I found the seller and contacted them, and they said we don't care, we're going to mail it to this old address eBay supplied.
I contacted the post office, but they said the shipper had not made available any means to intercept or redirect the package, even if I paid extra.
The item was lost forever. EBay said the seller probably didn't see my message until after it was sent - but the seller replied to my message, which was sent within at most 20 minutes of seeing that eBay intended to ship my package to a wrong address rather than the one I had given them. The seller ("my-best-source") literally told me they were going to send it to the wrong address. It wasn't shipped until the following day. They stole $70+ from me, and gave me nothing in return.
Please never, ever try to buy anything from eBay, and certainly not from "my-best-source." You will regret it. They automatically generate fake 5-star reviews when you place an order! My experience - the most awful customer service experience I've ever had - generated fake 5-star reviews. They then don't let you rate the company that cheats you for at least a full week, by which time most people have forgotten.
Go to a reputable company like Amazon instead - or better yet, find small, independent sellers rather than experienced but dying corporate cheats like the ones who run eBay.