ebay didn't he ask me my side just took the seller side
EBay's money back guarantee policy is to decide cases according to the tracking record. If this states that an item was delivered - or even that delivery was attempted - the buyer is not eligible for a refund through eBay. You accepted this policy in the user agreement. If you can disprove the tracking record you may be able to appeal the decision.
If it was left half-out of the letter box it may well have been stolen. Theft of parcels from the doorstep is so commonplace that the police in some areas are advising buyers to use click and collect services instead.
Delivery issues have become one of the biggest risks of buying on eBay.