I am curious as to who is liable for chasing up missimg items sent via Royal Mail. Is it the seller or the buyer? I see many sellers on e-bay who state that it is not their problem if things go missing and they will supply the necessary evidence for buyer to claim. I don't have a problem but as I said, I'm curious!!
There could be one downside to this question, when dealing with eBay sellers. You pay for the item, and do not receive it. Seller then ignores your email. Item and money end up the same way, unless of high value, then you may be able to raise a dispute claim.
They're not the responsibility of the buyer in these circumstances, but of the carrier/insurer - who is responsible to the seller for the safety of the goods whilst in transit and to the point of delivery.
The buyer has no responsibility for purchased goods whilst in transit from the seller.