What is considered acceptable proof that goods have been delivered within the EU?

Question

I’m struggling to find information on what is considered acceptable proof that goods have left the UK and have been delivered to another EU country so the goods can be zero rated?

The gov.uk website states:

‘you must also obtain and keep valid evidence that the goods have been removed from the UK within certain time limits to be able to zero rate’

Does anybody know if a signed certificate of entry from the receiver of the goods is considered acceptable?

This question is awaiting an answer
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