Can anyone advise me how to make a complaint against a seller which is now time expired under ebay T & C?

I honestly can't see a valid reason to report a seller this far down the line - if you bought something (a job lot of meccano, or similar, I'm guessing) and there are some pieces missing then this is something that should've been raised within 30 days.

Seller shipped item with 50+ parts missing of 260.9 | Member To Member Support

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Seller shipped item with 50+ parts missing of 260.9 | Member To Member Support | eBay UK