Have you contacted the seller?
After four DAYS the seller can start an Unpaid Item Claim. After four more DAYS he can close it. The transaction ends. You get a Strike on your buyer account. The seller gets his selling fees back. Neither of you can leave feedback.
Buyers with Strikes are automatically Blocked from bidding by many if not most sellers.
And check your Paypal account. You may actually have paid.
If the item was marked as Paid, and eBay has not contacted you about an Unpaid Item Dispute, then the seller may well have shipped the item to you.
Contact the seller through eBay Messages. Ask if he has shipped, when, and by what service.