You are quite correct in that you will lose a Not Received case because the tracking will show something was delivered, but not what the package contained.
You need to open a return using the reason! parts missing, or Does not match description, the seller will get 3 working days to resolve the case.
They can either ask for the other item to be returned and refund the whole lot on return, or they can offer to send you the missing items, or they can offer a partial refund.
You can accept whichever is best for you but do not let your seller run you out of time by waiting for a replacement. If you haven't received the item or a refund in a timely manner escalate to ebay for them to step in and refund you.
Edit: your seller will have to send you a pre paid label if they want the item back. This must be sent within the 3 working days.
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