Here is my sob story. Was never able to get any kind of info from Ebay as to what happened, or why.
Disney Train I got on black Friday. Selling for 315.00
Gets purchased and paid for. I pack it up, ready to ship next day. Print Label that night. Late the next day, one hour before postal run, I get a message from buyer saying their account has been hacked and want me to cancel. No biggie, I do just that. Had not shipped item so all good, right? So, I immediately relist the item. Sells again a couple days later to new buyer. This time I send it off. A day later I get a message from the new buyer that their account has been hacked and they want me to cancel. Of course after the 300$ set is in the mail. Luckily I was able to stop the shipment mid transit, for a cost of course, and have it sent back.
Both buyers were in different states and had decent(100+) feedback. Both bought the same item, both said account was hacked. eBay gave me no information and I refunded both buyers after eBay gave me the green light. Got my Train back, with a headache in return. The train has now been banished from eBay.