Hmmm. How you proceed with you case depends on how the seller fulfilled this order.
If you ordered 20 items and 20 parcels were dispatched with tracking, it's as easy as filing Item Not Received (INR) cases for the ones that didn't come because they are individual transactions.
But if you ordered two orders with 10 items each, and seven were missing in one order and eight were missing in another order, you have on your hands TWO Significantly Not As Described (SNAD) cases. This is because you received something but not what you ordered as it was incomplete.
You really want to open the SNAD instead of the INR because if tracking shows Delivered on any part of that order, you will automatically lose the case. (SNAD sometimes involves filing police reports too to solidify your claims of fraud by mail.)
It may be worth calling ebay Customer Service.
The plot will thicken because ebay probably won't let you open your cases until it's too late to do so (as recently happened to me as a buyer) but paypal SNAD cases require buyers to return the orders at their own cost. With tracking. Which often exceeds the value of the order placed. I think you need to talk to CSReps about it to decide your best course of action.
If none of the items were shipped with tracking, open your Items Not Received cases. But you will have to wait until the delivery estimate date is passed because you must presume the seller is still planning to send them to you. He might be drop-shipping. Or only temporarily out of stock.
You must must must look at seller feedback before making your choices on ebay. As a new buyer, I learned the hard way that the best 'deal' was often the opposite because the seller would fail to deliver it. As anywhere else in life, you get what you pay for. Or don't. Any there's really not much of an excuse for feedback lower than 99 per cent.
