You need to see proof of delivery not proof of postage.
I had an item ebay last month (makita charger), chinese seller sent recorded empty packet claimed it had been delivered, had to wait a bit but ebay refunded.
Was it royal mail or another delivery company, driver may remember who/where left, they tend to do the same route every day.
Good luck, but I think if the seller refuses it will be difficult for you.
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