Have you checked with neighbours and around your propertly or if send Royal Mail then contact your local Delivery office
If you have not recieved your item and it is past the latest estimated day of delivery on the item description by a few days then open a not recieved dispute at the bottom of the page under Resolution Centre
Escalate it too ebay after 8 full days
You have 30 days from the latest estimated day of delivery on the item description to open a dispute
Ebay money back guarantee
http://pages.ebay.co.uk/ebay-money-back-guarantee/
