Question Author
Going through your answers sequentially:
Chinajan:
I have not sent him my NI number, and will not do so unless I get some explanation of the legality of why I should do so.
Buenchico:
On neither of the photo attachments of the package is there any sign of the 'CN22' form, or of that appellation anywhere in the text, that you mentioned.
TonyV:
The company is Discogs, which is a platform for record/CD sellers all over the world to list items they have for sale. I have bought hundreds of items from their sellers over the last decade, but Discogs is not responsible for the transactions or any charges, and the sellers have to provide their own documentation. But until now, this anomaly has not emerged with any purchase I've made from any of their sellers, in any country. Nor has there ever been any additional charge over and above the quoted price + shipping. Once the order has been placed and paid for on Discogs, the deal is solely between you and the seller, and Discogs will only step in if there has been some violation of their guidelines. As far as I can recall, Discogs have never requested any such details from me, and my purchases have been straightforward from the very start.
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As far as I can see, the seller is at fault, perhaps for not attaching the CN22 customs form. But also, surely a significant point to make is that the order was placed on 19th December - 13 days before any new rules from Brexit came into force. The label on the packet in the first attached photo he sent me shows a despatch date of 13th January - which is way too long a delay from order to dispatch, and critically took my order unwittingly over the borderline between one set of rules and another.
On the packet that came back to him from Italian customs, there is, as he stated, a label which had been stuck over my name and address by the courier, which gives the return date as 15th January - so confirming that the packet was not returned, as he claimed, by the customer - me - but obviously by the Italian postal authority.
But note that he has said "...however I try to send it back" (I take it he forgot to apply the future tense in that statement). So my inclination is to give it a further week or two without replying to him, and see what happens.
Any more suggestions?
Thanks everybody!