I'm sorry you've had worse luck than I've had.
Out of curiosity, I searched for the seller "miss_my_car" that you mentioned. Couldn't find anything. Do you have a link?
Scammers on EBay will often delete (or EBay will delete) their profile as soon as the scam has been paid.
That's happened to me a couple of times, I bought something at a price too good to be true. It was. The seller's profile was deleted after....nothing was ever shipped....I contacted EBay each time, there was no problem, they gave me the refund....I think I had to wait a while for it, but it always came.
If you ordered a couple of ballscrews and all you got was a tap case....it seems like a no brainer to me....you will get a refund, it's just going to cost you some of your time to argue your case, and navigate the EBay menus which can be hard to use. In your case I'd report it as a fraud and get someone from EBay on the phone.
I just bought some new surplus "Martin" brand ball bearing idler sprockets for #40 Chain on EBay. Real nice. $10 each. Arrived in 3 days.
So what are you building?