[durden666]

680 grams Is too heavy for a partial.

If they open an Investigation and deduct the weight of the missing Item from the total weight of the consignment, and then add It to the dispatched & received weights, It will conclude that the Item was delivered. On the other hand, given It's the busy time of year with the Influx of orders and claims, they may simply Issue a refund.

Good luck.

Is there any other method you would recommend?

As with the DNA, the "wrong Item received", Is considered a universal method that works with the majority of companies.

Any advice on dealing with a company that sends you a CCTV photo of them packing your item, saying they dispatched the correct items ? No timestamp etc also.

Also can you check your DMs please?