In the last week I'be had two eBay purchases refunded by the seller. The first was shipped, but the USPS has no record of ever receiving the package. The seller assumes it was stolen and refunded the purchase. He told me if it ever arrives to keep it and just leave a positive review.
The second kind of upsets me. Avery nice Nikkorex F with light meter, cases, Nikkor-S 50mm, original receipts etc. Two days after I paid the seller sends me a message that it had fallen off a shelf and was smashed. So the order was cancelled. I smell some BS that fell off a shelf. Anyway I ended up paying like $40 more for one without all the extras on shopgoodwill...