That is true - that is something that does happen on occasion.

Wouldn't necessarily affect the seller bar the fact you might leave a negative - but they could get that removed.

tressygirl is correct - if the item was lost in post or not delivered then ebay should refund.

Where it falls down is on the instances like yours where a delivery is recorded but you can't find it - for whatever reason that might be - stolen parcel if left on doorstep. ebay will simply take the fact a delivery was recorded as proof, no matter what you say.

Its not great at all of course - these instances do happen - but if you use amazon - it goes completely the opposite way - amazon will believe the customer if they claim its not been delivered - seller will lose out.